American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 628
FIG. 386. I fc^.<^*--,^-—-^ rrrrrlk ^ ^. —H>: … threads of the screw are so arranged that MICKOMErER WIRE GAUGE. in one revolution of the screw it moves toor from the extension F,tlie .025 of an inch, that is, the one fortieth of an inch. Theperpendicular marks to the right of zero on e are so arranged that, starting from zero,each of them…
Telegraph
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