American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 66
efer to pinning), on thetable of the upright drill, and with one of themodern twist-drills the task is rendered a veryeasy one. After the pivot-holes are drilled,we run through a round broach, finishedlengthwise and hardened, which acts as a finereamer, straightening and polishing the… … .a sectional view at the pivot-hole. It willbe observed that instead of countersinkingfor the oil, the reverse is the case. A is ahardened steel plate counterbored into the clockplate B, and held in its place by the screws.There should be a small space between thesteel plate and the crown of the…
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
