Fig. 169.
The overshot wheel (Fig. 168) is harder to make, but is a livelier wheel. It is put together upon the same principle as the wheel just shown, except that the paddles, which do not project beyond the circumference of the disks, are not placed radially, but so that, with the addition of another set inserted to connect them, they form buckets.
Fig. 170.
To lay off the lines for the buckets, divide the circumference of each disk as before, and from the centre describe a small circle, as shown in Fig. 169. From the points on the circumference draw lines tangent to the small circle. These lines will give the positions for the bottoms of the buckets. To complete the buckets mark from the circumference equal distances on these lines, and from these last points draw lines as ab to the next points on the circumference. First, nail together with only the bottoms of the buckets (on the lines ca). Then fit in the other pieces, to complete the buckets, on the lines ab. The ends of these last pieces should properly be bevelled (see Bevelling) to make a fairly tight joint. The rest of the work is the same as for the undershot wheel. A larger form (but harder to make) is suggested in Fig. 170. See note under Windmills, above.
Totlet Town.