From Boyhood to Manhood: Life of Benjamin Franklin

by William Makepeace Thayer

"When I was a boy I amused myself one day with flying a paper kite; and, approaching the bank of a pond, which was nearly a mile broad, I tied the string to a stake, and the kite ascended to a very considerable height above the pond, while I was swimming. In a little time, being desirous of amusing myself with my kite, and enjoying at the same time the pleasure of swimming, I returned; and, loosing from the stake the string with the little stick which was fastened to it, went again into the water, where I found that, lying on my back and holding the stick in my hands, I was drawn along the surface of the water in a very agreeable manner. Having then engaged another boy to carry my clothes around the pond, to a place which I pointed out to him on the other side, I began to cross the pond with my kite, which carried me quite over without the least fatigue, and with the greatest pleasure imaginable. I was only obliged occasionally to halt a little in my course, and resist its progress, when it appeared that, by following too quick, I lowered the kite too much; by doing which occasionally, I made it rise again. I have never since that time practised this singular mode of swimming, though I think it not impossible to cross in this manner from Dover to Calais. The packet-boat, however, is still preferable."

Doctor Franklin wrote another long letter to a man in mature life, advising him to learn to swim. The man was not inclined to do it on account of his age, whereupon Doctor Franklin wrote:

"I can not be of opinion with you, that it is too late in life for you to learn to swim. The river near the bottom of your garden affords a most convenient place for the purpose. And, as your new employment requires your being often on the water, of which you have such a dread, I think you would do well to make the trial; nothing being so likely to remove those apprehensions as the consciousness of an ability to swim to the shore in case of an accident, or of supporting yourself in the water till a boat could come to take you up."

It is probable that Benjamin's experiment with his kite in swimming was the seed-thought of his experiment in drawing lightning from the clouds with a kite, thirty years thereafter,—an experiment that startled and electrified the scientific world. The story is a familiar one, and should be repeated here.

He believed that lightning and electricity were identical. Experiments for six years had led him to this conclusion. But how could he prove it? He conceived the idea of an electrical kite by which he could settle the truth or falsity of his theory. Having prepared the kite, he waited for a thunder-shower; nor did he wait long. Observing one rising, he took the kite, and with his son, twenty-one years of age, stole away into a field near by, where there was an old cow-shed. He had not informed any one but his son of his purpose, because he wished to avoid ridicule in case the experiment proved a failure.

The kite was sent up in season for the coming storm to catch, and, with intense anxiety, Franklin held the string, which was hempen, except the part in the hand, which was silk. He was so confident of success that he brought along with him a Leyden bottle, in which to collect electric fluid from the clouds for a shock. It was a moment of great suspense. His heart beat like a trip-hammer. At first a cloud seemed to pass directly over the kite, and the thunder rattled, and the lightnings played around it, and yet there was no indication of electricity. His heart almost failed him. But in silence he continued the experiment as the storm increased and drew nearer, and the artillery of heaven grew louder and more vivid. Another moment, and he beheld the fibers of the hempen cord rise as the hair of a person does on the insulated stool. What a moment it was! The electric fluid was there! His experiment was successful! Electricity and lightning are identical! Pen nor poesy can describe his emotion. Eagerly he applied his knuckles to the key, attached to the extremity of the hempen cord, and drew a spark therefrom. His joy was immeasurable! Another spark, and then another, and still another, until further confirmation was unnecessary! The Leyden bottle was charged with the precious fluid, from which both father and son received a shock as unmistakable as that from his electric battery at home. Franklin's fame was secured throughout the world. He went home with feelings of indescribable satisfaction.

Doctor Franklin was a very modest man, and he wrote a letter to Peter Collinson, member of the Royal Society of London, dated Philadelphia, Oct. 16, 1752, describing the experiment without even hinting that he was the experimenter. As that letter described his electrical kite, and his method of using it, we insert it here:

"As frequent mention is made in public papers from Europe of the success of the Philadelphia experiment for drawing the electric fire from clouds by means of pointed rods of iron erected on high buildings, etc., it may be agreeable to the curious to be informed that the same experiment has succeeded in Philadelphia, though made in a different and more easy manner, which is as follows:

"Make a small cross of two light strips of cedar, the arms so long as to reach 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 hand is to be tied a silk ribbon, and where the silk and twine join a 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 vial may be charged; and from the electric fire thus obtained spirits may be kindled, and all 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."