Lot 167
Faraday, Michael -- Autograph Letter Signed Re Fall of a Divided vs. Undivided Body (1791-1867) English physicist and chemist whose many experiments contributed greatly to the understanding of electromagnetism. His main discoveries include the principles underlying electromagnetic induction, diamagnetism and electrolysis. He is considered one of the greatest scientists of all time. Autograph letter signed "M Faraday," one page, with blind, embossed seal of the Royal Institution of Great Britain, 7 x 4¼, no place, Sept. 26, 1857. To C.C. Maxwell, Esq.: "There will be a difference in the time of the fall of the divided & the undivided body it will in most cases be quite invisible as in Gallileo expt but if the fall is through a resisting medium there will be a difference with difference of size. Take a sphere of gold it falls with a certain velocity through air or through water….(?) it into dust & it will fall far more slowly as the particles, or pieces are larger the difference will be less & soon become invisible but philosophically it must exist." Light toning and two small mounting remnants on verso of integral blank leaf, else fine. Estimate $1,000 - 1,500
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