The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 190
t can, of course, be arranged in a simplerform according to the number of sets of springs employed,These relays are generally wound to a resistance of 250 ohms. RELAY AND LAMP SIGNALLING 165 and the triple form operates with a current of about 30 milli-amperes. Western Electric Co.s Cut-Off… … Plan of Lower (Cut-off) RelayFig. 189 attached at the side by means of a spring, and normallypresses inward against the pointed end of an adjustingscrew, shown on the right. When operated (by a current ofabout 73 milhamperes) the armature moves away from the coilto the pole-piece and the lower…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-140-47.webp)
