Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 179
Figure 164. — Wiring Diagram of theTelegraph Relay. 168 MAGNETIC EFFECT OF CURRENT put in; and also a key (K) and a relay (R). Next, the wireruns to Toledo; and again a key and a relay are connected in series with the line. Itgoes then to Cleveland,where still another key,relay, and battery are… … Figure 165. — Photograph of theTelegraph Relay.
Physics
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