Question

Did Benjamin Franklin fly a kite in a thunderstorm?

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Answer

He said he did, but the account is thinner than its fame suggests, and historians have raised serious doubts.

What the record contains. Franklin published a brief description of a proposed kite experiment in the Pennsylvania Gazette in October 1752, written in the third person and describing how such an experiment could be conducted. He did not describe performing it, give a date, or name a witness.

The familiar detailed narrative — Franklin and his son William, a silk kite, a key, a Leyden jar — comes from Joseph Priestley, writing fifteen years later in 1767, apparently from conversation with Franklin.

The grounds for doubt, argued most prominently by Tom Tucker in Bolt of Fate (2003):

No contemporary witness account.

Franklin's own reticence about a discovery he would have had every reason to document precisely.

Chronological problems in the later versions, including William's age — he was in his early twenties, not the child of popular illustration.

Lethality. The experiment as usually depicted, with a kite struck by lightning, would very likely have killed him. Georg Wilhelm Richmann, a Russian physicist attempting a comparable experiment in 1753, was electrocuted and died.

The defence. Most historians of science accept a version of the account, with an important clarification: the kite was almost certainly not struck by lightning. Franklin's own description involves drawing ambient electrical charge from a storm cloud — a far less energetic and survivable effect, detected as sparks from the key. That is a genuine and repeatable phenomenon, and it demonstrated his point.

What is not in doubt is the underlying science. Franklin proposed that lightning was electrical, designed the sentry box experiment to test it, and that experiment was successfully performed in France by Thomas-François Dalibard in May 1752, before the kite. Franklin's hypothesis was confirmed by others first.

The lightning rod followed, and was his genuinely consequential contribution.

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