An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 128
s a sounderand a couple of gravity cells (Fig. 62). As the relay armature moves back and Line forth it makesand breaks thelocal circuit andreproduces in itthe signals whichpass over themain line. Thesounder in thelocal circuit givesthe signals ex-actly as theypass over theline. The tele-graph… … Local Battery Fig. 62. —Apparatus at telegraph station, including key,relay, and local circuit, with battery and sounder. 104 ELECTRICITY AND MAGNETISM used to supply the current; and the key is provided with ashort-circuited switch (Fig. 59), which keeps the circuit closedwhen the key is not in…
Electricity · Magnetism
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