Wolff, Alfred R · New York, J. Wiley & sons · leaf 140
f the wheel. These rims are of hard wood, and sawedout, to receive the sails; the inner and outer rims beingsawed at different angles, so as to give a screw shape tothe sails. The frame of the rudder is made of gas-pipe,and trussed, and has malleable iron clamps to hold thewood cross-pieces which… … 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.
Windmills
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