American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 600
held out of the groove of y l>y the ai-mature lever / of the register. When the latteris closed the knife edge of the lever / is placed in that groove v, whereupon it 490 AMERICAN TELEGRAPH!. quickly starts to complete the local circuit at x, and, if the registers armature lever isnot at once…
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-1001-453.webp)
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-98-38.webp)