Molly Ayala
The connection between lightning and electricity has captivated humans since ancient times. In 600 BC, the Greek philosopher Thales observed that rubbing amber with a dry cloth caused it to attract feathers and straw, demonstrating static electricity. However, it was Benjamin Franklin's kite experiment in 1752 that provided pivotal insights into the electrical nature of lightning. Despite popular belief, Franklin's kite was not directly struck by lightning, but rather, it captured the ambient electrical charge from the storm. This experiment, along with subsequent ones, established the link between lightning and electricity, paving the way for further exploration and innovations in the field of electricity.
| Characteristics | Values |
|---|---|
| Year lightning is electricity discovered | 1752 |
| Person who discovered it | Benjamin Franklin |
| Date of the experiment | June 1752 |
| Location of the experiment | Philadelphia |
| Purpose of the experiment | To demonstrate the electrical nature of lightning |
| Outcome of the experiment | Proved the connection between lightning and electricity |
| Use of tools | Kite, hemp string, silk string, metal key, Leyden jar |
| Assistance | Son William |
| Recognition | Copley Medal from the Royal Society in 1753 |
| Previous experiments | Thales, William Gilbert, Denis Barberet, Jean-Antoine Nollet |
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What You'll Learn
Benjamin Franklin's kite experiment in 1752
In 1752, Benjamin Franklin hypothesized that lightning and electricity were the same phenomenon. To test his hypothesis, he designed an experiment to draw electricity from the sky using a kite. Franklin's experiment was first proposed in June 1752, and he reportedly conducted it with the help of his son, William, in Philadelphia.
Franklin's experiment involved flying a kite with a pointed conductive wire attached to its apex, flown near thunderclouds to collect static electricity from the air. The kite string was a wet hemp string that conducted the electricity down to the ground. A metal key was attached to the hemp string, which was then connected to a Leyden jar (an early form of capacitor). The kite string was also tied to an insulating silk ribbon for Franklin to hold with his knuckles.
As the kite drew close to a dark cloud, the kite string became electrified. When Franklin put his knuckle close to the key, he drew off sparks, proving that lightning and electricity were indeed the same. This experiment demonstrated Franklin's earlier observation that a sharp metal rod would conduct electricity away from a charged sphere.
Franklin's discoveries led to many advancements in understanding electricity and protecting against lightning strikes. He invented lightning rods, which are still used today to prevent lightning-caused fires. The experiment also resulted in Franklin receiving the Copley Medal from London's Royal Society and an honorary doctorate from the University of St. Andrews in Scotland.
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Franklin's lightning rod invention
Benjamin Franklin is credited with discovering that lightning is electricity through his famous kite experiment in 1752. However, it was in 1746 in Boston, Massachusetts, that Franklin first stumbled upon other scientists' electrical experiments. He quickly turned his home into a laboratory, experimenting with items he found around the house.
Franklin was fascinated by storms and loved to study them. By 1750, he wanted to prove that lightning was electricity and began thinking about protecting people, buildings, and other structures from lightning damage. This led to his idea for the lightning rod. Franklin envisioned an iron rod about 8 to 10 feet long, sharpened to a point at the end. He theorized that lightning could be prevented by using an elevated iron rod connected to the ground, thereby diverting the electrical charge from the cloud.
Franklin described his invention as follows:
> "May not the knowledge of this power of points be of use to mankind, in preserving houses, churches, ships, etc., 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...Would not these pointed rods probably draw the electrical fire silently out of a cloud before it came nigh enough to strike, and thereby secure us from that most sudden and terrible mischief!"
He advocated for lightning rods with sharp points, while his English colleagues favored blunt-tipped rods, believing that sharp ones attracted lightning and increased the risk of strikes.
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Jean-Antoine Nollet's speculations in 1749
Jean-Antoine Nollet was a French clergyman and physicist born on November 19, 1700. He was particularly interested in the new science of electricity. In 1749, Nollet speculated on the electrical nature of lightning, which led to the issue being posed as a prize question in Bordeaux that year. This prize question sparked further interest in the topic, leading to a public discussion in France the following year. Denis Barberet's dissertation on the subject received an award in Bordeaux in 1750.
Nollet's 1749 work, "Recherches sur les causes particulières des phénomènes électriques" (translated as "Research on the Particular Causes of Electrical Phenomena"), explored his theories on electricity. He proposed that electric fluid constantly streams out of an electrified body and into other objects through pores. This theory sparked controversy in Europe, and Nollet defended his views passionately. He also corresponded with Benjamin Franklin, a fellow scientist who would later gain fame for his kite experiment investigating the link between lightning and electricity.
In his letters to Franklin, Nollet expressed scepticism about Franklin's proposal to use rods to draw lightning from clouds. He believed that Franklin's idea was erroneously founded, arguing that just months earlier, the connection between lightning and electricity was still a conjecture. Despite their differences, Franklin did acknowledge Nollet's work, particularly his experiments with conductors, which influenced the development of lightning rods.
Nollet's contributions to the understanding of electricity extended beyond his speculations on lightning. He was the first to recognise the importance of sharp points on conductors in the discharge of electricity, and he gave the name "Leyden jar" to the invention of Pieter van Musschenbroek. Nollet also made observations on a wide range of topics, including the anatomy of insects, fertilisation of frogs, thermometry, pneumatics, phosphorescence, magnetism, and electricity.
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Denis Barberet's dissertation in Bordeaux in 1750
In 1752, Benjamin Franklin proposed the kite experiment to investigate the nature of lightning and electricity, which were not yet fully understood. However, the idea for this experiment was sparked by earlier discussions and theories proposed by other scientists, including Denis Barberet.
Denis Barberet was a French biologist, veterinarian, and physician born in 1714 in Bourgogne, a wine-growing region. He studied medicine in Montpellier and later practised medicine in various parts of Europe, including Italy, Minorca in the Balearics, Germany, and France. He was also a doctor in the French Navy. Barberet became known for his scientific memoirs, which were recognised by several learned societies.
In 1749, speculations made by Jean-Antoine Nollet led to the issue of the electrical nature of lightning being posed as a prize question in Bordeaux. This sparked interest among scientists, and in 1750, the topic was the subject of public discussion in France. During these discussions, Denis Barberet presented a dissertation in Bordeaux, for which he received a prize. Unfortunately, the specific contents of his dissertation are not readily available. However, it is known that Barberet proposed a cause in line with the triboelectric effect, suggesting a link between lightning and electricity.
Following these discussions, Franklin, who had been interested in electricity since 1746, began to focus on proving that lightning and electricity were the same. He proposed using conductive rods to attract lightning and devised the kite experiment to test his theory. Franklin's experiment, with the assistance of his son William, successfully demonstrated that lightning and electricity were indeed the same phenomenon.
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Jacques de Romas' mémoire in 1750
In 1752, Benjamin Franklin proposed an experiment to investigate the nature of lightning and electricity, which were not yet fully understood. This experiment, now known as the kite experiment, was first conducted by Franklin with the help of his son, William.
In the years preceding Franklin's kite experiment, several scientists proposed theories connecting lightning and electricity. One such scientist was Jacques de Romas, a French physicist and judiciary officer in his lifelong hometown of Nérac. Romas is known for his physical experiments during thunderstorms.
In 1750, Romas proposed a connection between lightning and electricity when the Chateau of Tampouy was struck by lightning. He studied the effects of lightning at the Chateau de Tampouy and later on the towers of the fortified Moulin de Barbaste. This led to the idea of diverting lightning using a metal bar. In the same year, he invented a device to measure atmospheric voltage, which his colleague, François de Vivens, named the brontomètre.
Also in 1750, Denis Barberet published a dissertation on the supposed connection between lightning and electricity, which received a prize in Bordeaux. This sparked public discussion in France about the relationship between lightning and electricity. Romas conducted Franklin's kite experiment in 1753, three years after Franklin proposed it in a letter to Peter Collinson. Romas's experiment was the first public demonstration of the kite experiment and took place near Nérac on the road to Mézin.
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Frequently asked questions
In 1752, Benjamin Franklin proposed the kite experiment to investigate the nature of lightning and electricity. In 1753, he received the prestigious Copley Medal from the Royal Society in recognition of his "curious experiments and observations on electricity".
The kite experiment is a scientific experiment in which a kite with a pointed conductive wire attached to its apex is flown near thunderclouds to collect static electricity from the air and conduct it down the wet kite string to the ground.
No, Benjamin Franklin did not discover electricity. Electrical forces had been recognized for more than a thousand years, and scientists had worked extensively with static electricity. Franklin’s experiment demonstrated the connection between lightning and electricity.
