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 55
. Thesame battery, with the zinc of one connected to the platinumof the other, has quantity one, intensity two. 4. What effects require great intensity? An intensity current will go a greater distance, overcomegreater resistance, or leap across a wider space. 5. What is accomplished by quantity?… … 1. The Magnet.—1. What is an electro-magnet? Fis- 20- A bar of iron subjected to the influ- S ence of a voltaic current becomes polar-ized by induction and is hence called anelectro-magnet. 2. The Melix.—l. How is the current applied? The wire from the battery is coiledElectro-Magnet. spirally…
Telegraph
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