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Benjamin Franklin FRS FRSE (January 17, 1706 [O.S. January 6, 1705][1] – April 17, 1790) was an American polymath and one of the Founding Fathers of the United States. Franklin was a leading author, printer, political theorist, politician, freemason, postmaster, scientist, inventor, humorist, civic activist, statesman, and diplomat. As a scientist, he was a major figure in the American Enlightenment and the history of physics for his discoveries and theories regarding electricity. As an inventor, he is known for the lightning rod, bifocals, and the Franklin stove, among other inventions.[2] He founded many civic organizations, including the Library Company, Philadelphia's first fire department[3] and the University of Pennsylvania.[4]
Franklin earned the title of "The First American" for his early and indefatigable campaigning for colonial unity, initially as an author and spokesman in London for several colonies. As the first United States Ambassador to France, he exemplified the emerging American nation.[5] Franklin was foundational in defining the American ethos as a marriage of the practical values of thrift, hard work, education, community spirit, self-governing institutions, and opposition to authoritarianism both political and religious, with the scientific and tolerant values of the Enlightenment. In the words of historian Henry Steele Commager, "In a Franklin could be merged the virtues of Puritanism without its defects, the illumination of the Enlightenment without its heat."[6] To Walter Isaacson, this makes Franklin "the most accomplished American of his age and the most influential in inventing the type of society America would become."[7]
Franklin became a successful newspaper editor and printer in Philadelphia, the leading city in the colonies, publishing the Pennsylvania Gazette at the age of 23.[8] He became wealthy publishing this and Poor Richard's Almanack, which he authored under the pseudonym "Richard Saunders". After 1767, he was associated with the Pennsylvania Chronicle, a newspaper that was known for its revolutionary sentiments and criticisms of British policies.
He pioneered and was first president of Academy and College of Philadelphia which opened in 1751 and later became the University of Pennsylvania. He organized and was the first secretary of the American Philosophical Society and was elected president in 1769. Franklin became a national hero in America as an agent for several colonies when he spearheaded an effort in London to have the Parliament of Great Britain repeal the unpopular Stamp Act. An accomplished diplomat, he was widely admired among the French as American minister to Paris and was a major figure in the development of positive Franco-American relations. His efforts proved vital for the American Revolution in securing shipments of crucial munitions from France.
He was promoted to deputy postmaster-general for the British colonies in 1753, having been Philadelphia postmaster for many years, and this enabled him to set up the first national communications network. During the revolution, he became the first United States Postmaster General. He was active in community affairs and colonial and state politics, as well as national and international affairs. From 1785 to 1788, he served as governor of Pennsylvania. He initially owned and dealt in slaves but, by the 1750s, he argued against slavery from an economic perspective and became one of the most prominent abolitionists.
His colorful life and legacy of scientific and political achievement, and his status as one of America's most influential Founding Fathers, have seen Franklin honored more than two centuries after his death on coinage and the $100 bill, warships, and the names of many towns, counties, educational institutions, and corporations, as well as countless cultural references.
Franklin earned the title of "The First American" for his early and indefatigable campaigning for colonial unity, initially as an author and spokesman in London for several colonies. As the first United States Ambassador to France, he exemplified the emerging American nation.[5] Franklin was foundational in defining the American ethos as a marriage of the practical values of thrift, hard work, education, community spirit, self-governing institutions, and opposition to authoritarianism both political and religious, with the scientific and tolerant values of the Enlightenment. In the words of historian Henry Steele Commager, "In a Franklin could be merged the virtues of Puritanism without its defects, the illumination of the Enlightenment without its heat."[6] To Walter Isaacson, this makes Franklin "the most accomplished American of his age and the most influential in inventing the type of society America would become."[7]
Franklin became a successful newspaper editor and printer in Philadelphia, the leading city in the colonies, publishing the Pennsylvania Gazette at the age of 23.[8] He became wealthy publishing this and Poor Richard's Almanack, which he authored under the pseudonym "Richard Saunders". After 1767, he was associated with the Pennsylvania Chronicle, a newspaper that was known for its revolutionary sentiments and criticisms of British policies.
He pioneered and was first president of Academy and College of Philadelphia which opened in 1751 and later became the University of Pennsylvania. He organized and was the first secretary of the American Philosophical Society and was elected president in 1769. Franklin became a national hero in America as an agent for several colonies when he spearheaded an effort in London to have the Parliament of Great Britain repeal the unpopular Stamp Act. An accomplished diplomat, he was widely admired among the French as American minister to Paris and was a major figure in the development of positive Franco-American relations. His efforts proved vital for the American Revolution in securing shipments of crucial munitions from France.
He was promoted to deputy postmaster-general for the British colonies in 1753, having been Philadelphia postmaster for many years, and this enabled him to set up the first national communications network. During the revolution, he became the first United States Postmaster General. He was active in community affairs and colonial and state politics, as well as national and international affairs. From 1785 to 1788, he served as governor of Pennsylvania. He initially owned and dealt in slaves but, by the 1750s, he argued against slavery from an economic perspective and became one of the most prominent abolitionists.
His colorful life and legacy of scientific and political achievement, and his status as one of America's most influential Founding Fathers, have seen Franklin honored more than two centuries after his death on coinage and the $100 bill, warships, and the names of many towns, counties, educational institutions, and corporations, as well as countless cultural references.
Benjamin Franklin - Wikipedia
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THE LIFE OF BENJAMIN FRANKLIN - Discovery History Biography (full documentary)
the life of benjamin franklin (full documentary). thanks for watching history life discovery science technology tech learning education national nature geogr
Thank you, my friend Maj Marty Hogan for letting us know that January 17 is the anniversary of the birth of leading author, printer, political theorist, politician, freemason, postmaster, scientist, inventor, humorist, civic activist, statesman, and diplomat Benjamin Franklin FRS, FRSE .
His writings collected in Poor Richard Almanack
Rest in peace Benjamin Franklin!
THE LIFE OF BENJAMIN FRANKLIN - Discovery History Biography (full documentary)
https://www.youtube.com/watch?v=Ddv2CCxM57s
Image: 1700s Poor Richards Almanack; 1739 Poor Richard Almanack; 1733 Poor Richard Almanack; A page about human anatomy in Poor Richard's Almanac
Background from famousscientists.org/benjamin-franklin/
"Lived 1706 – 1790.
Benjamin Franklin lived his life in the spirit of a renaissance man: he was deeply interested in the world around him, and he excelled in several widely differing fields of human endeavor.
He had a profound effect on our understanding of electricity and shaped the language we use when we talk about it, even today.
Here we shall concentrate on his life as a scientist and an inventor, only briefly touching on his other achievements.
Benjamin Franklin’s Early Life and Education
Benjamin Franklin was born on January 17, 1706, in Boston, Massachusetts. His father, Josiah, was a tallow chandler, candle maker, and soap boiler who had moved to the American Colonies from England. His mother, Abiah Folger looked after the home and was the mother of ten children, including Benjamin, who was the eighth child in the family. She was born in Nantucket, Massachusetts.
Benjamin had only two years of formal education, which finished when he was ten years old, because his family could not afford the fees. His informal education then accelerated, because his mind was too restless to stop learning.
He had to work in his father’s business, but in his spare time he read everything he could, about every subject under the sun.
When he was twelve, Benjamin began working as an apprentice in a printing shop owned by one of his elder brothers, James. When his brother started printing a newspaper, Benjamin wrote to it in the name of “Mrs. Dogood” in defense of freedom of speech.
Aged 17, Benjamin Franklin left for Philadelphia, escaping from his apprenticeship, which was against the law. He was, however, free. After a few months in Philadelphia he left for London, England, where he learned more about printing, before returning to Philadelphia at the age of 20 to continue his printing career.
Benjamin Franklin – Publisher
By the age of just 23, Franklin had become the publisher of the Philadelphia Gazette.
Aged 27, in December 1732, the first editions of the publication that would make him a wealthy man rolled off his printing press: Poor Richard’s Almanac, which Franklin would publish annually for the next 25 years. It was a general interest pamphlet offering interest and amusement for its readers, including: ‘how to’ guides, practical tips, stories, astrological forecasts, and brain teasers.
With each year he published the Almanac, his financial position grew more secure, and Franklin’s fertile mind began looking for new outlets.
He continued reading as much as he could, increasing his knowledge of science and technology until he was in a position to begin innovating himself.
Benjamin Franklin’s Science, Innovation, and Inventions
Franklin was an original thinker, scientist and inventor. Dating his inventions is not always easy, because Franklin did not patent them. He said that anyone who wanted to make money from his ideas was free to do so. This means the dates of his inventions are approximate.
Bifocal Spectacles
Franklin wore spectacles for most of his life. He felt limited by them, because any lens that was good for reading blurred his vision when he looked up. Working as a printer, this became infuriating.
He defeated the problem in about 1739, aged 33, with his invention of split-lens bifocal spectacles. Each lens now had two focusing distances. Looking through the bottom part of the lens was good for reading, while looking through the upper part offered good vision at a greater distance.
The Franklin Stove
As Franklin read more about science, he learned more about heat transfer. He looked at the design of a typical stove and concluded that it was inefficient. Much more heat was lost up the flue than necessary.
He decided to redesign the stove using the concept of heat-exchange/heat recovery.
The idea was that hot gases which would normally simply go up the flue would exchange their heat with cold air from the room, heating it up, and so heating the room up.
In 1741, the Franklin Stove came on to the market, allowing homeowners to get more heat into their homes for each unit of fuel they burned.
Franklin wrote: The use of these fireplaces in very many houses, both of this and the neighboring colonies, has been, and is, a great saving of wood to the inhabitants.
American Philosophical Society
In 1743, Franklin founded the American Philosophical Society. (In those days, scientists were called philosophers.) The Society offered a scientific forum for new ideas, including Franklin’s electrical theories.
The Size of the Units of Matter
Benjamin Franklin performed a beautiful experiment using surfactants; on a pond at Clapham Common, he poured a small amount of oleic acid, a natural surfactant which tends to form a dense film at the water-air interface. He measured the volume required to cover all the pond. Knowing the area, he then knew the height of the film, something like three nanometers in our current units.
Electricity
In summer 1743, Franklin visited his hometown of Boston. Always seeking new knowledge, he visited a science show. There he saw Dr. Archibald Spencer, who had arrived from Scotland, demonstrating a variety of scientific phenomena. The electrical part of the show intrigued Franklin most: it featured the effects of static electricity.
Franklin left the show determined to learn more about electricity. It seemed to him that Dr. Spencer didn’t really understand it. This, of course, was true: nobody understood it! It was more a source of entertainment than a science.
In 1747, Franklin got hold of a long glass tube for the efficient generation of static electricity from Peter Collinson in London.
Soon, Franklin was spending much of his time studying electricity. He wrote:
“For my own part, I never was before engaged in any study that so totally engrossed my attention and my time as this has lately done.”
Shaping our understanding of electricity
Franklin’s observations soon began to shape the world’s understanding of electricity and shape the language we use even today when we talk about it.
He identified that there was an electrical fluid that could flow from A to B. To describe the process he coined the terms positive and negative to describe the difference between A and B after the electrical fluid had flowed. Of course, today we would call the electrical fluid electrons, but remember: this was 1747; J.J. Thomson’s discovery of the electron lay 150 years in the future!
Franklin found that an excess of fluid led to positive charge (okay, we’ll have to pretend that electrons are positively charged for this) and a deficit of fluid led to negative charge.
Franklin was the first to write that electric charge cannot be created; it can only be ‘collected.’ This is a fundamental law of physics – the Law of Conservation of Electric Charge. It means that you cannot create (or destroy) electric charge.
Franklin was also the first person to use the words electrical battery. His meaning was not the same as ours though. His battery was made of capacitors (known as Leyden jars) wired together in series to store more charge than one alone could. This enabled Franklin to produce a bigger discharge of static electricity in his experiments.
In 1751, Franklin published the fruits of his labors in a book called Experiments and Observations on Electricity, which was widely read in Britain and then Europe, shaping a new understanding of electricity.
In 1752, Franklin carried out his most famous scientific work, proving that lightning is electricity. He did this using one of his own discoveries: that static electricity discharges to a sharp, pointed object more readily than to a blunt object.
Here are his own words on the subject:
From Benjamin Franklin’s Experiments and Observations on Electricity
Benjamin Franklin
“As electrified clouds pass over a country, high hills and high trees, lofty towers, spires, masts of ships, chimneys, etc, as so many prominences and points, draw the electrical fire, and the whole cloud discharges there…
“If these things are so, may not the power of points be of use to mankind, in preserving houses, churches,… from the stroke of lightning, by directing us to fix on the highest parts of those edifices, upright rods of iron made sharp as a needle… and from the foot of those rods a wire down the outside of the building into the ground…?
Benjamin Franklin’s Proposed Sentry Box
“I would propose an experiment… On the top of some high tower or steeple, place a kind of sentry-box big enough to contain a man and an electrical stand. From the middle of the stand, let an iron rod rise and pass bending out of the door, and then upright 20 or 30 feet, pointed very sharp at the end. If the electrical stand be kept clean and dry, a man standing on it when such clouds are passing low might be electrified and afford sparks, the rod drawing fire to him from a cloud. If any danger to the man should be apprehended (although I think there would be none) let him stand on the floor of his box, and now and then bring near to the rod a loop of wire that has one end fastened to the leads he his holding by a wax handle; so the sparks, if the rod is electrified, will strike from the rod to the wire and not affect him.”
King Louis XV saw a translation of Experiments and Observations on Electricity, and he asked French scientists to test Franklin’s lightning rod concept. In Paris in May 1752 Jean Francois Dalibard used Franklin’s idea to confirm by experiment that lightning was indeed electrical.
Franklin himself carried out similar work in 1752, using a kite with a metal key connected to a Leyden Jar to prove his theory. He didn’t write about this experiment, however, until 1772.
The significance of the lightning rod experiments was that they established the study of electricity as a serious scientific discipline.
Franklin had shown how to prove that electrical phenomena, such as lightning, were a fundamental force of nature. Electricity would never again be thought of as just an interesting plaything for scientists and showmen to conjure up using glass rods.
Very soon, in 1753, when he was aged 47, the transformation in science that Franklin had brought about was recognized. Britain’s Royal Society honored his electrical work with its highest award, the Copley Medal – the equivalent of a modern Nobel Prize.
The Lightning Rod
A building protected by a lightning rod. A cable carries electricity from lightning to ground.
Even today, we still use Benjamin Franklin’s lightning rod.
Like his other ideas, he did not patent it: he profited from the lightning rod intellectually, not financially.
Since the time he invented it, it has saved societies all over the world great amounts of time and money by protecting buildings from damage. It has also, of course, saved countless lives.
Refrigeration
In 1758, working with John Hadley in Cambridge, England, Franklin investigated the principle of refrigeration by evaporation.
In a room at 18 °C (65 °F) the scientists repeatedly wetted a thermometer with ether, then used bellows to quickly evaporate the ether.
They were finally able to achieve a temperature reading on the thermometer of -14 °C (7 °F).
We now know the reason for the refrigeration effect. We have learned that molecules in a liquid have a range of energies. Some have high energy, and some have low energy. Molecules carrying the most energy escape from the liquid most easily – they evaporate. This leaves the lower energy molecules in the liquid. The result is that the temperature of the liquid falls.
Of his discovery, Franklin said:
“One may see the possibility of freezing a man to death on a warm summer’s day.”
In fact, the principle of cooling by evaporation had been publicly demonstrated by William Cullen in Edinburgh, Scotland in 1756. Cullen had used a pump to lower the pressure above ether in a container. The reduced pressure caused the ether to evaporate rapidly through boiling, absorbing heat from the air around it, and causing ice to form on the container sides.
Meteorology
By observing storms and winds, Franklin discovered that storms do not always travel in the direction of the prevailing wind. This was an important discovery in the development of the scientific discipline of meteorology.
More than a Scientist and Inventor
Franklin lived in turbulent times, which culminated in the United States’ Declaration of Independence in 1776: Franklin was one of the five men who drafted it. He had previously acted as British postmaster for the colonies; he was the American Ambassador in France from 1776 – 1785; and the governor of Pennsylvania from 1785 – 1788.
The End
Benjamin Franklin died on April 17, 1790, at the age of 84. He was killed by pleurisy – a lung inflammation.
His wife, Deborah, had died sixteen years earlier. Franklin was survived by his daughter, Sarah, who looked after him in his later years and his son, William. William left America to live in Britain in 1782.
Today, the Benjamin Franklin Medal, named in Franklin’s honor, is one of the most prestigious awards in science. Its winners include Alexander Graham Bell, Marie and Pierre Curie, Albert Einstein and Stephen Hawking."
FYI Nicci Eisenhauer Kathlean KeeslerSGT Tim Fridley (Join to see) CPT Enrique M. Michael Horne SSG David Andrews CW5 Jack Cardwell SPC Gary Welch SGT Rick Colburn SMSgt Tom Burns SP5 Geoffrey Vannerson SPC Paul C. MSgt Dale Johnson Capt (Join to see) CWO3 Randy Weston Alan K.
His writings collected in Poor Richard Almanack
Rest in peace Benjamin Franklin!
THE LIFE OF BENJAMIN FRANKLIN - Discovery History Biography (full documentary)
https://www.youtube.com/watch?v=Ddv2CCxM57s
Image: 1700s Poor Richards Almanack; 1739 Poor Richard Almanack; 1733 Poor Richard Almanack; A page about human anatomy in Poor Richard's Almanac
Background from famousscientists.org/benjamin-franklin/
"Lived 1706 – 1790.
Benjamin Franklin lived his life in the spirit of a renaissance man: he was deeply interested in the world around him, and he excelled in several widely differing fields of human endeavor.
He had a profound effect on our understanding of electricity and shaped the language we use when we talk about it, even today.
Here we shall concentrate on his life as a scientist and an inventor, only briefly touching on his other achievements.
Benjamin Franklin’s Early Life and Education
Benjamin Franklin was born on January 17, 1706, in Boston, Massachusetts. His father, Josiah, was a tallow chandler, candle maker, and soap boiler who had moved to the American Colonies from England. His mother, Abiah Folger looked after the home and was the mother of ten children, including Benjamin, who was the eighth child in the family. She was born in Nantucket, Massachusetts.
Benjamin had only two years of formal education, which finished when he was ten years old, because his family could not afford the fees. His informal education then accelerated, because his mind was too restless to stop learning.
He had to work in his father’s business, but in his spare time he read everything he could, about every subject under the sun.
When he was twelve, Benjamin began working as an apprentice in a printing shop owned by one of his elder brothers, James. When his brother started printing a newspaper, Benjamin wrote to it in the name of “Mrs. Dogood” in defense of freedom of speech.
Aged 17, Benjamin Franklin left for Philadelphia, escaping from his apprenticeship, which was against the law. He was, however, free. After a few months in Philadelphia he left for London, England, where he learned more about printing, before returning to Philadelphia at the age of 20 to continue his printing career.
Benjamin Franklin – Publisher
By the age of just 23, Franklin had become the publisher of the Philadelphia Gazette.
Aged 27, in December 1732, the first editions of the publication that would make him a wealthy man rolled off his printing press: Poor Richard’s Almanac, which Franklin would publish annually for the next 25 years. It was a general interest pamphlet offering interest and amusement for its readers, including: ‘how to’ guides, practical tips, stories, astrological forecasts, and brain teasers.
With each year he published the Almanac, his financial position grew more secure, and Franklin’s fertile mind began looking for new outlets.
He continued reading as much as he could, increasing his knowledge of science and technology until he was in a position to begin innovating himself.
Benjamin Franklin’s Science, Innovation, and Inventions
Franklin was an original thinker, scientist and inventor. Dating his inventions is not always easy, because Franklin did not patent them. He said that anyone who wanted to make money from his ideas was free to do so. This means the dates of his inventions are approximate.
Bifocal Spectacles
Franklin wore spectacles for most of his life. He felt limited by them, because any lens that was good for reading blurred his vision when he looked up. Working as a printer, this became infuriating.
He defeated the problem in about 1739, aged 33, with his invention of split-lens bifocal spectacles. Each lens now had two focusing distances. Looking through the bottom part of the lens was good for reading, while looking through the upper part offered good vision at a greater distance.
The Franklin Stove
As Franklin read more about science, he learned more about heat transfer. He looked at the design of a typical stove and concluded that it was inefficient. Much more heat was lost up the flue than necessary.
He decided to redesign the stove using the concept of heat-exchange/heat recovery.
The idea was that hot gases which would normally simply go up the flue would exchange their heat with cold air from the room, heating it up, and so heating the room up.
In 1741, the Franklin Stove came on to the market, allowing homeowners to get more heat into their homes for each unit of fuel they burned.
Franklin wrote: The use of these fireplaces in very many houses, both of this and the neighboring colonies, has been, and is, a great saving of wood to the inhabitants.
American Philosophical Society
In 1743, Franklin founded the American Philosophical Society. (In those days, scientists were called philosophers.) The Society offered a scientific forum for new ideas, including Franklin’s electrical theories.
The Size of the Units of Matter
Benjamin Franklin performed a beautiful experiment using surfactants; on a pond at Clapham Common, he poured a small amount of oleic acid, a natural surfactant which tends to form a dense film at the water-air interface. He measured the volume required to cover all the pond. Knowing the area, he then knew the height of the film, something like three nanometers in our current units.
Electricity
In summer 1743, Franklin visited his hometown of Boston. Always seeking new knowledge, he visited a science show. There he saw Dr. Archibald Spencer, who had arrived from Scotland, demonstrating a variety of scientific phenomena. The electrical part of the show intrigued Franklin most: it featured the effects of static electricity.
Franklin left the show determined to learn more about electricity. It seemed to him that Dr. Spencer didn’t really understand it. This, of course, was true: nobody understood it! It was more a source of entertainment than a science.
In 1747, Franklin got hold of a long glass tube for the efficient generation of static electricity from Peter Collinson in London.
Soon, Franklin was spending much of his time studying electricity. He wrote:
“For my own part, I never was before engaged in any study that so totally engrossed my attention and my time as this has lately done.”
Shaping our understanding of electricity
Franklin’s observations soon began to shape the world’s understanding of electricity and shape the language we use even today when we talk about it.
He identified that there was an electrical fluid that could flow from A to B. To describe the process he coined the terms positive and negative to describe the difference between A and B after the electrical fluid had flowed. Of course, today we would call the electrical fluid electrons, but remember: this was 1747; J.J. Thomson’s discovery of the electron lay 150 years in the future!
Franklin found that an excess of fluid led to positive charge (okay, we’ll have to pretend that electrons are positively charged for this) and a deficit of fluid led to negative charge.
Franklin was the first to write that electric charge cannot be created; it can only be ‘collected.’ This is a fundamental law of physics – the Law of Conservation of Electric Charge. It means that you cannot create (or destroy) electric charge.
Franklin was also the first person to use the words electrical battery. His meaning was not the same as ours though. His battery was made of capacitors (known as Leyden jars) wired together in series to store more charge than one alone could. This enabled Franklin to produce a bigger discharge of static electricity in his experiments.
In 1751, Franklin published the fruits of his labors in a book called Experiments and Observations on Electricity, which was widely read in Britain and then Europe, shaping a new understanding of electricity.
In 1752, Franklin carried out his most famous scientific work, proving that lightning is electricity. He did this using one of his own discoveries: that static electricity discharges to a sharp, pointed object more readily than to a blunt object.
Here are his own words on the subject:
From Benjamin Franklin’s Experiments and Observations on Electricity
Benjamin Franklin
“As electrified clouds pass over a country, high hills and high trees, lofty towers, spires, masts of ships, chimneys, etc, as so many prominences and points, draw the electrical fire, and the whole cloud discharges there…
“If these things are so, may not the power of points be of use to mankind, in preserving houses, churches,… from the stroke of lightning, by directing us to fix on the highest parts of those edifices, upright rods of iron made sharp as a needle… and from the foot of those rods a wire down the outside of the building into the ground…?
Benjamin Franklin’s Proposed Sentry Box
“I would propose an experiment… On the top of some high tower or steeple, place a kind of sentry-box big enough to contain a man and an electrical stand. From the middle of the stand, let an iron rod rise and pass bending out of the door, and then upright 20 or 30 feet, pointed very sharp at the end. If the electrical stand be kept clean and dry, a man standing on it when such clouds are passing low might be electrified and afford sparks, the rod drawing fire to him from a cloud. If any danger to the man should be apprehended (although I think there would be none) let him stand on the floor of his box, and now and then bring near to the rod a loop of wire that has one end fastened to the leads he his holding by a wax handle; so the sparks, if the rod is electrified, will strike from the rod to the wire and not affect him.”
King Louis XV saw a translation of Experiments and Observations on Electricity, and he asked French scientists to test Franklin’s lightning rod concept. In Paris in May 1752 Jean Francois Dalibard used Franklin’s idea to confirm by experiment that lightning was indeed electrical.
Franklin himself carried out similar work in 1752, using a kite with a metal key connected to a Leyden Jar to prove his theory. He didn’t write about this experiment, however, until 1772.
The significance of the lightning rod experiments was that they established the study of electricity as a serious scientific discipline.
Franklin had shown how to prove that electrical phenomena, such as lightning, were a fundamental force of nature. Electricity would never again be thought of as just an interesting plaything for scientists and showmen to conjure up using glass rods.
Very soon, in 1753, when he was aged 47, the transformation in science that Franklin had brought about was recognized. Britain’s Royal Society honored his electrical work with its highest award, the Copley Medal – the equivalent of a modern Nobel Prize.
The Lightning Rod
A building protected by a lightning rod. A cable carries electricity from lightning to ground.
Even today, we still use Benjamin Franklin’s lightning rod.
Like his other ideas, he did not patent it: he profited from the lightning rod intellectually, not financially.
Since the time he invented it, it has saved societies all over the world great amounts of time and money by protecting buildings from damage. It has also, of course, saved countless lives.
Refrigeration
In 1758, working with John Hadley in Cambridge, England, Franklin investigated the principle of refrigeration by evaporation.
In a room at 18 °C (65 °F) the scientists repeatedly wetted a thermometer with ether, then used bellows to quickly evaporate the ether.
They were finally able to achieve a temperature reading on the thermometer of -14 °C (7 °F).
We now know the reason for the refrigeration effect. We have learned that molecules in a liquid have a range of energies. Some have high energy, and some have low energy. Molecules carrying the most energy escape from the liquid most easily – they evaporate. This leaves the lower energy molecules in the liquid. The result is that the temperature of the liquid falls.
Of his discovery, Franklin said:
“One may see the possibility of freezing a man to death on a warm summer’s day.”
In fact, the principle of cooling by evaporation had been publicly demonstrated by William Cullen in Edinburgh, Scotland in 1756. Cullen had used a pump to lower the pressure above ether in a container. The reduced pressure caused the ether to evaporate rapidly through boiling, absorbing heat from the air around it, and causing ice to form on the container sides.
Meteorology
By observing storms and winds, Franklin discovered that storms do not always travel in the direction of the prevailing wind. This was an important discovery in the development of the scientific discipline of meteorology.
More than a Scientist and Inventor
Franklin lived in turbulent times, which culminated in the United States’ Declaration of Independence in 1776: Franklin was one of the five men who drafted it. He had previously acted as British postmaster for the colonies; he was the American Ambassador in France from 1776 – 1785; and the governor of Pennsylvania from 1785 – 1788.
The End
Benjamin Franklin died on April 17, 1790, at the age of 84. He was killed by pleurisy – a lung inflammation.
His wife, Deborah, had died sixteen years earlier. Franklin was survived by his daughter, Sarah, who looked after him in his later years and his son, William. William left America to live in Britain in 1782.
Today, the Benjamin Franklin Medal, named in Franklin’s honor, is one of the most prestigious awards in science. Its winners include Alexander Graham Bell, Marie and Pierre Curie, Albert Einstein and Stephen Hawking."
FYI Nicci Eisenhauer Kathlean KeeslerSGT Tim Fridley (Join to see) CPT Enrique M. Michael Horne SSG David Andrews CW5 Jack Cardwell SPC Gary Welch SGT Rick Colburn SMSgt Tom Burns SP5 Geoffrey Vannerson SPC Paul C. MSgt Dale Johnson Capt (Join to see) CWO3 Randy Weston Alan K.
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