The steamboat kite, Figs. 156 and 157, is another application of the moving wheel but this construction is simpler and the attachment of wheel is better. In this model a part of the wheel is shielded from the breeze, so the uneven pressure causes it to revolve. This is a very feasible and interesting problem. Fig. 158 shows a kite with a wagging head above it. When we understand this device, we should be able to plan many others. The windmill is set in the open part of the kite. Two cross-sticks are used so it is quite easy to attach a vertical piece to the two for support of the aluminum wheel. A little hub has a groove in it that a cord belt runs in, and from that to another grooved wheel to the back of the kite, Fig. 159. A lath nail cut off for a small crank pin, _j_, is located near the outer edge of this grooved wheel. A vertical lever, _h_, with axis at _i_, has an elongated hole at the lower end that works over the crank-pin and as _k_ revolves, the lever operates from side to side. The hole must be long enough for the crank-pin to reach its highest and lowest point easily. The elongated hole can be effected by extending a wire loop down from the end of the vertical lever to work on the crank-pin. The wire should be lashed with linen thread to the vertical lever and coated over with glue. An object can be used on the upper end, such as a head, a flag, etc. In the same manner, hands and feet may be extended and withdrawn, a turtle might be made to draw in head and feet and many other interesting operations, but in all of these the machinery must work easily, must not lop over against anything else and above all we must remember not to load down our kite with weight or overbalance it with undue leverage at any part of the kite. [Illustration: FIG. 159.] [Illustration: FIG. 160.] [Illustration: FIG. 161.] Another way of attaching to windmill is to make the wire axle long enough to pass thru and at the back bend into a crank, Fig. 160. The lever _h_ would work direct on this crank as it does on the crank-pin in the device with the second grooved pulley, _k_, Fig. 159. To make the head go up and down, use a round hole instead of the elongated ones in the vertical shaft. A loop of wire, Fig. 161, should hold the upper part of the vertical lever in place, and in case of the head bobbing up and down, the lever is not attached at _i_, Fig. 159, but the loop, Fig. 161, must not be omitted.