American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 50
, open yourcompass to any convenient dis-tance, as B C, and draw th(arcs which intersect at D; fromC, through D, draw a line pro-longed toward E, at pleasure ;take the distance, C D, in youicompass, and lay it off from Dto E, then a line drawn fromthe point E to B, will be theperpendicular…
Clocks and watches
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