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 592
cept for small exchanges or onlong party lines. There are many different types of circuitsfor telephones operated by a central or common battery.Figure 381 shows the connections of a desk telephone instru-ment as used by the Associated Bell Telephone Companies.In this diagram r is the ringer, S and… … Fig. 381. — Connections for Bell deskset to be used with, common battery. 528 ELECTRICITY AND MAGNETISM
Electricity · Magnetism
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