Wolff, Alfred R · New York, J. Wiley & sons · leaf 141
Fig. 39. ii8 THE WINDMILL AS A PRIME MOVER. line of the wind-wheel shaft stands off somewhat from,though it is parallel to, the plane of the rudder. Thewheel of the mill is a distinguishing characteristic. … Fig. 40. The blades, which have a helical curve, are about threefeet long by two feet wide. They are made of No. 24sheet-iron, fastened securely to curved iron ribs, andbolted to a double set of one and one-eighth by five-sixteenths inch iron arms. EXPERIMENTS ON WINDMILLS. II9 CHAPTER VIII.…
Windmills
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