Foster, Edwin W. [from old catalog] · Garden City, N.Y., Doubleday, Page & company · leaf 189
O, o M … U Fig. 100. A six-bladed mill driving into the forward point a round-headed screw,or by attaching another small propeller. In fact, if MILLS AND WEATHER VANES 167 the hole in this propeller is made large enough, thescrew can be used as the pivot; in any event, thevane must be balanced by adding…
Carpentry · Woodwork
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