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Updated: May 21, 2025
I believe he held that office to the last. 'Believe me, my dear Tyndall, yours truly, 'J. P. Gassiot. 'Dr. Tyndall. From a letter written by Faraday himself soon after his appointment as Davy's assistant, I extract the following account of his introduction to the Royal Institution: 'London, Sept. 13, 1813.
Gassiot and Professor Plücher had published their experiments on the stratification of the electric light; and that series of discoveries by scientific men abroad, but chiefly by our own philosophers at home, which had been in progress for a course of years, prepared the way for Bunsen and Kirchhof's marvellous consummation.
Davy was helpful to the young man, and this should never be forgotten: he at once wrote to Faraday, and afterwards, when an opportunity occurred, made him his assistant. Mr. Gassiot has lately favoured me with the following reminiscence of this time: 'Clapham Common, Surrey, 'November 28, 1867. 'My Dear Tyndall, Sir H. Davy was accustomed to call on the late Mr.
Gassiot, solved this problem. He erected a battery of 4000 cells, and with it urged a stream of sparks from terminal to terminal, when separated from each other by a measurable space of air. The memoir on the 'Electricity of the Voltaic Pile, published in 1834, appears to have produced but little impression upon the supporters of the contact theory.
This appears to have been subsequently forgotten, as we find later physicists questioning the possibility of the spark leaping over any interpolar distance. Mr. J. P. Gassiot, of Clapham, demonstrated the inaccuracy of this opinion by constructing a battery of 3,000 Leclanche cells, which gave a spark of 0.025 inch; a similar number of "de la Rue" cells gives an 0.0564 inch spark.
When the late excellent and lamented Lord Wrottesley resigned the presidency of the Royal Society, a deputation from the council, consisting of his Lordship, Mr. Grove, and Mr. Gassiot, waited upon Faraday, to urge him to accept the president's chair.
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