American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 280
res are looked upon in the metricor any other system, or if they are taken to re-present inches or parts—the ratios being con-stant in all cases. According to the above, we represent theprimitive radius of our wheel A of 60 teeth,Fig. 4 •-= 229.2093, and the distance of thecentres of wheel and… … at an angle of 40o with the line of centres 0 B,and hence the contact before line of centres 360° — _ 40° = 20°. It is necessary to leave this example for atime, to take up a sub-illustration to ascertainthe result of double contact. The questionbeing, does double contact continue, or is…
Clocks and watches
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