The book Cyclopedia of Telephony Telegraphy Vol 1 8 7 was written by author Charles Thom Here you can read free online of Cyclopedia of Telephony Telegraphy Vol 1 8 7 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Cyclopedia of Telephony Telegraphy Vol 1 8 7 a good or bad book?
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It is obvious that an up-and-down motion of the hook leverwill move the long spring _9_ in such manner as to cause electricalcontact either between it and the two upper springs _7_ and _8_, orbetween it and the two lower springs _10_ and _11_. The hook is shownin its raised position, which is the position required for talking. When lowered the two springs _7_ and _8_ are disengaged from the longspring _9_ and from each other, and the three springs _9_, _10_, and_11_ are brought into electrical ...engagement, thus establishing thenecessary signaling conditions. [Illustration: Fig. 83. Long Lever Hook Switch] The right-hand ends of the contact springs are shown projecting beyondthe insulating supports. This is for the purpose of facilitatingmaking electrical joints between these springs and the various wireswhich lead from them. These projecting ends are commonly referred toas ears, and are usually provided with holes or notches into which theconnecting wire is fastened by soldering. _Western Electric.
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