Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 39
1. Is there any exceptions to this? Where the intensity is great and long continued especiallyon the surface of poor conductors the charge will penetrateand the cups must be used more than once to remove it. 30. Insulating Stool.—1 What is the apparatus for chargirgthc humanbody? An insulating…
Telegraph
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