The Pinion-Wheel Windmill may be made of cardboard or tin. A circular piece 10 or 12 inches in diameter is required.
After marking out the outer edge with a compass, describe
an inner circle about 1 inch inside of it; then draw two
lines through the center at right angles to each other, and another pair at an angle of 45 degrees t0 these. These lines are shown by the heavy radial lines in Fig. 5. One-half inch from each of these lines draw a parallel line, as indicated by dotted lines in Fig. 5.
The next thing to do is to cut out the disk, and cut along the
heavy lines just as far as the lines are shown in the diagram (Fig. 5), and then to bend up the blades thus separated, to an angle of about 45 degrees, bending on the second set of radial lines (dotted lines in Fig. 5).
You had better make a cardboard pinion-wheel first, then a tin one after wards, as cardboard is so much easier to cut. A pair of heavy shears will be necessary for cutting a tin wheel, and a cold chisel for separating the edges of the blades.
To Mount the Pinion-Wheel drive a long nail through the center, through the hole in a spool, and into the end of a stick. Then nail the stick to a post or a fence top.