Today In History: June 10, 1752 Benjamin Franklin Flies His Kite

On this day in 1752, Benjamin Franklin flies a kite during a thunderstorm and collects a charge in a Leyden jar when the kite is struck by lightning, enabling him to demonstrate the electrical nature of lightning. Franklin became interested in electricity in the mid-1740s, a time when much was still unknown on the topic, and spent almost a decade conducting electrical experiments. He coined a number of terms used today, including battery, conductor and electrician. He also invented the lightning rod, used to protect buildings and ships.

The Kite
As described by Benjamin Franklin to Peter Collinson on October 19, 1752: Make a small cross of two light strips of cedar, the arms so long as to reach to the four corners of a large thin silk handkerchief when extended; tie the corners of the handkerchief to the extremities of the cross, so you have the body of a kite; which being properly accommodated with a tail, loop, and string, will rise in the air, like those made of paper; but this being of silk is fitter to bear the wet and wind of a thunder gust without tearing. To the top of the upright stick of the cross is to be fixed a very sharp pointed wire, rising a foot or more above the wood. To the end of the twine, next the key may be fastened. This kite is to be raised when a thunder-gust appears to be coming on, and the person who holds the string must stand within a door or window, or under some cover, so that the silk ribbon may not be wet; and care must be taken that the twine does not touch the frame of the door or window. As soon as any of the thunder clouds come over the kite, the pointed wire will draw the electric fire from them, and the kite, with all the twine, will be electrified, and the loose filaments of the twine, will stand out every way, and be attracted by an approaching finger. And when the rain has wetted the kite and twine, so that it can conduct the electric fire freely, you will find it stream out plentifully from the key on the approach of your knuckle. At this key the phial may be charged: and from electric fire thus obtained, spirits may be kindled, and all the other electric experiments be performed, which are usually done by the help of a rubbed glass globe or tube, and thereby the sameness of the electric matter with that of lightning completely demonstrated.

Franklin’s Lightning Bells
In the early 1750s, Franklin erected a lightning rod on top of his house for the purposes of experimentation, protection and possibly to get electricity for experimentation without having to go through the arduous process of constructing a primitive battery.

Franklin’s "iron rod" drew lightning down into his house. The rod was connected to a bell and a second bell was connected to a grounded wire. Every time there was an electrical storm, the bells would ring and sparks would light up his house.

Franklin was born on January 17, 1706, in Boston, to a candle and soap maker named Josiah Franklin, who fathered 17 children, and his wife Abiah Folger. Franklin’s formal education ended at age 10 and he went to work as an apprentice to his brother James, a printer. In 1723, following a dispute with his brother, Franklin left Boston and ended up in Philadelphia, where he found work as a printer. Following a brief stint as a printer in London, Franklin returned to Philadelphia and became a successful businessman, whose publishing ventures included the Pennsylvania Gazette and Poor Richard’s Almanack, a collection of homespun proverbs advocating hard work and honesty in order to get ahead. The almanac, which Franklin first published in 1733 under the pen name Richard Saunders, included such wisdom as: “Early to bed, early to rise, makes a man healthy, wealthy and wise.” Whether or not Franklin followed this advice in his own life, he came to represent the classic American overachiever. In addition to his accomplishments in business and science, he is noted for his numerous civic contributions. Among other things, he developed a library, insurance company, city hospital and academy in Philadelphia that would later become the University of Pennsylvania.

Most significantly, Franklin was one of the founding fathers of the United States and had a career as a statesman that spanned four decades. He served as a legislator in Pennsylvania as well as a diplomat in England and France. He is the only politician to have signed all four documents fundamental to the creation of the U.S.: the Declaration of Independence (1776), the Treaty of Alliance with France (1778), the Treaty of Paris (1783), which established peace with Great Britain, and the U.S. Constitution (1787).
Franklin died at age 84 on April 17, 1790, in Philadelphia. He remains one of the leading figures in U.S. history.