Summarized Proceedings for the Period From ... And a Directory of Members As of ... No. 33
Summarized Proceedings for the Period From ... And a Directory of Members As of ... No. 33
American Association for the Advancement of Science
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Yet how delicate and eflScient they are I Compare the instruments employed by Franklin, and even by Faraday, with those which are in constant use to-day in our physical laboratories. Franklin, by the utmost effort of his imagination, could not con- ceive, probably, of a mirror-galvanometer that can detect the elec- trical action of a drop of distilled water on two so-called chemically pure platinum plates, or of a machine that can develop from the feeble magnetism of the earth a current suffici...ently strong to light the city of Philadelphia* Let him who wanders among the historical physical instruments of many of our college collections stand before the immense frictional electrical machine of Franklin's day, or gaze Digitized by Google ADDRESS BT J. TROWBRIDGE. 95 upon the rude electrometers and galvanometers. of that time, and contrast Franklin's machine with the small Toepler-Holtz electri- cal machine which with a tenth of the size gives a spark ten times as strong as Franklin's ; or the electrometers and galvanometers of Faraday with the mirror-galvanometers and electrometers of Sir William Thomson.
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