The boy's own book of indoor games and recreations : a popular encyclopædia for boys (1890)
Stables, Gordon, 1840-1910, Hutchison, George Andrew, 1841-1913 · Philadelphia : J.B. Lippincott · leaf 108
skew like the fans of a screw propeller,so that it will catch the wind in revolving. Now fix a block of wood to the bottomof the case and fix the fly to it by a small brass screw passing through its centre, sothat it works freely and is 2>^ in. from the centre of the driving pulley R and… … Fig. S. As we require the pulleys bb to revolve about twelve times, and as they areattached to the minute-hand spindle, the hour-hand spindle will revolve once.Therefore, on this spindle fix behind the pulley b, by soldering, a circular plate oftin or brass, a little larger than the pulley, and cut…
Games · Amusements
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