[Fig. 1] represents the case and model complete. Divide the interior of the box into two portions by a horizontal partition, fastened to the back and sides by glue and screws. The space below the partition is to be 7 in. deep. In the right of this space fit a cash drawer 9 in. long, 3 in. deep, and 3 in. wide, to hold the pennies. The side of this drawer nearest the machinery must have a slot cut in it for the starting lever (A, [Fig. 3]) to work in. The sides of the case are made of wood, so that the working of the model can only be seen from the front and so that the flow of pennies will be larger.
Paint the back of the inside of the case to represent a landscape, or a suitably coloured picture can be pasted in, and serve the horizontal partition in the same manner to represent ground, blending the back and ground together in a natural manner. Paint also the top board to represent sky.
Make the mill out of wood or cardboard. It is to be 73⁄4 in. high, and the holes for the spindle carrying the sails 53⁄4 in. from the bottom. The sails are to be 91⁄2 in. across, and can be made of wood or cardboard, or, better still, wood cross-pieces with cardboard sails. Make the spindle of iron wire 1⁄8 in. in thickness. It should be about 31⁄2 in. long. Flatten one end of the wire and drive it into the centre point of the cross-pieces of the sails, being careful to keep it quite square and upright.
Pass the spindle through the holes in the back and front of the mill, and put a knob of sealing-wax on the end, to prevent it working out when the mill is at work. If the mill is made of cardboard, the inside must be strengthened with wood to support the spindle.
We will next turn our attention to the mechanism to set the mill in motion. Very few of my readers possess the tools and skill to use them necessary to cut and fit the wheels, and, as it would come very expensive to get them made specially, it will come very much cheaper to buy one of the cheap eight-day clocks, which will suit our purpose admirably. These can be procured at most of the suitable shops, and will cost about 5s. 6d.
Take the frame and works out of the clock case, and remove the pendulum and hands, as you will not require them. If you now turn round the spindle on which the minute hand fits, you will notice that, although the parts that carry the hands are in motion, the rest of the wheels are stationary. On examining these hand-turning wheels carefully, you will notice that the one carrying the minute hand is fixed on the central spindle by jambing only, and that it turns a small flat wheel which, in turn, gives motion to the wheel carrying the hour hand. This wheel is fixed to a tubular spindle, which fits over the spindle of the minute-hand wheel, which itself is tubular and jambs on the central spindle. Now, as you will not require this movement, take off the hour-hand wheel, and after removing the small flat wheel, replace it and fasten it, together with the minute-hand wheel, to the central spindle with solder.
Some of the cheap clocks have the minute hand fixed direct to the central spindle, the hour wheel only being tubular. In this case the hour wheel and the spindle must be soldered together after the small flat wheel has been removed. As you will not require the escapement wheel, push on one side the small spring clip that presses on the end of the spindle, and it will drop out.
Fig. 2.
