American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 443
its normal place. When the latterhas done so the camK is again in the path of pin p; hence the wheel w is stopped inits normal position. The contact spring a is supported by the frame of the box, but is insulatedtherefrom, formally, one end of a rests on the periphery of the break-wheel w,thus… … CENTRAL OFFICE AND CALL BOX—DISTRICT MESSENGER TELEGRAPH. ! j ly passes over the metal periphery and falls into the spaces between the teeth, there-by opening and closing the circuit. In the figure, there are 3 notches a uniform dis-tance apart, further on another notch In turning once, therefore,…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-971-442.webp)
![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher04nati-261-113.webp)
