Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
s as require to be observed at the instant theyare made or not at all. An electrical signal telegraj)li was employed in France, for ordinarypurposes, until it was replaced by Morses registering apparatus. 777. Figure 67.—Morses recording telegraph.—The electro-telegraphic device embraces— First, an… … Second, two other instruments, one for dispatching the message, andthe other for receiving or recording the message. The receiving or recording instrument. This consists essentially of 404 ELECTRICITY. a simple lever, L, called the pen-lever, provided with a soft armatuie,B, arranged over the poles…
Physics · Astronomy
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