Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 16
inthe science for 1,600 years. Name the properties of electricity — In itsnatural, unexcited state it does not exhibit its MANUAL OF TELEGRAPHY. 13 properties, because in that state it makes no mani-festations of itself. WJiat does it possess loJien excited — The powerof attraction and repulsion.… … In Fig. 1 we have a students Sset, that is,key and sounder on one board. It is connectedwith what is known as the gravity battery.The instrument has two posts from whichwires run to the battery. One wire runs to thezinc where it is connected with athumb-screw, the other runs tothe copper which is…
Telegraph
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