The telegraph in American and Morse memorial (1886)
Reid, James D · New York, Printed for the author by J. Polhemus · leaf 66
the following, which is evidently amethod by which, by means of a battery, a bar of iron can be takenby an electro magnet from the attraction of a fixed magnet, andrestored again on the breaking of the circuit, and thus, by recipro-cal action, motion be produced. In this process the fixed magnetis… … The cup in the sketch probably represents a cell of battery, orwhat seems as likely, a cup of mercury, in which the ends ofthe wire were immersed to form a connection, omitting thebattery. Following these appears a sketch of metal type, which will ap-pear hereafter in Mr. Morses own history of his…
Morse, Samuel Finley Breese, 1791-1872 · Telegraph
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