File:Detail showing Bell's liquid transmitter in a drawing by P.D. Richards of the experiments in early 1873.jpg
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Detail_showing_Bell's_liquid_transmitter_in_a_drawing_by_P.D._Richards_of_the_experiments_in_early_1873.jpg (359 × 300 pixels, file size: 17 KB, MIME type: image/jpeg)
English: P.D. Richards, Bell's friend and neighbor, wrote the inventor a letter on November 9, 1874 describing the transmission of telegraphic messages over wires using a liquid transmitter filled with mercury. This is a detail of the drawing included with the 1874 letter, which is in the Library of Congress
|Source||Library of Congress|
|Author||Alexander Graham Bell|
35 West Newton Street, Boston, MA
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