The gun and its mechanism can be made handily before the support E is fixed into place at the front of the crosspiece D. Shape the magazine P from sheet metal, making it 2⁵⁄₈ in. high, as detailed in [Fig. 4]. Make the gun Q from a piece of sheet metal, as detailed, cutting the metal to the exact dimensions indicated. Mount the magazine and the gun, and arrange the wire hammer R, and the rubber band that holds it. Fit the pulley A into place on its axle, supported by a small block of wood. Belt it to the front drive-wheel axle, as shown in [Fig. 5], after the gun support is fastened into place with screws. Make the projectiles of wood, as shown, and the fighting tank is ready to be tested before putting on the armor.

The armor is made of one deck piece, S, [Fig. 3], into which the covered turret is set, and two side pieces T, as detailed in [Fig. 2]. Make one left and one right sidepiece, allowing for the flanges all around, to be bent over and used for riveting or soldering the armor together. The bottom extension on the sidepieces is bent double to form an angle, on which the armor is supported, where it rests on the top of the hangers F. The turret is fitted to the deck by cutting notches along its lower edge, the resulting strips being alternately turned in and out along the point of joining, as shown in Fig. 3. When the armor is completed, it is fitted over the main frame, the gun projecting from the turret. Small pins hold the ends of the armor solid against the ends of the main frame C, so that the armor can be lifted off readily. The various parts of the fighting tank can be painted as desired, care being taken not to injure the points of bearing, on the axles and pulleys, which should be oiled. Silver bronze is a good finish for the exterior of the armor, which may be decorated with a coat of arms.

Fig. 5
Fig. 6

Plan and Side Elevation of the Interior Mechanism, with the Armor Removed, and Details of the Metal Fittings, the Ratchets, and the Tractor Bands

A Neat and Economical Baby Crib Made from a Clothes Basket

A Few Sticks of Wood and a Clothes Basket Make a Convenient Cradle for the Baby

A clothes basket on a simple but strong wooden frame, mounted on castors, makes a cradle which is as convenient and sanitary as many which are sold for five times its cost. It is light enough to roll out on the porch without difficulty, and may be padded and fitted with pillows until the most exacting mother is satisfied. The basket and frame should be painted, preferably some light color. The whole cost, not including pads or pillows, should not be over $2.50.—A. Switzer, Denver, Colo.

A Small Rheostat for Experiments and Testing