American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 64
the hour figures ; divide the outer circle into24 exactly equal parts, making a point or dotat each division ; then draw lines from thecentre to each of the 24 points, and these willbe the true hour lines. For the stile, erect inthe centre a pin or wire perpendicular to thedial plane. You will… … From a point in the centre draw three con-centric circles with your compass, to contain Draw a quadrant B 0, 90, and divide the arcinto 90 equal parts, which number as 10, 20,30, etc.; set one foot of your compass in B, anddraw the arc 90, A. The line A B will be thechord of 90 to the radius C B.…
Clocks and watches
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