II. The Motor Car.

The design for the motor car here given is quite plain so that those who desire to make it will have no difficulty in procuring the required materials. It consists of a wooden floor and body, type metal wheels and bearings for same made of brass strips; a small motor and clock work gearing. The method of casting the wheels is des-, cribed in a separate article in this magazine, excellent wheels being easily secured if reasonable care is taken to follow the directions. The axles-are straight iron wire 2" long and about 1/8" in diameter. Holes ate drilled in the centres of the wheels to receive the axles, the former being fixed in place with a little soft solder, put on with a blow torch. On one axle, before the second wheel is put on, is soldered a small brass pinion, which may be obtained from an old clock or purchased of any hardware dealer who carries brass gears. The size and pitch of the pinion is left to the choice of the maker as it is determined by the pitch of the gear in the connecting clockwork to be mentioned later.

Model Electric Railway 309

Fig. 2.

The bearings for the axles are made of strips of brass about 1-16" thick, 1/2" wide and 2" long. In the top ends, drill two holes for the screws which are used to attach the bearings to the car floor. The lower ends are bent to the shape shown in Fig. 2, first drilling a 1/8" hole, 1/4" from the end, to receive the axle, the end of which rests against the outside part of the bearing as shown. This arrangement allows the axle to turn freely but prevents side movement.

The floor of the car is 8" long, 33/4" wide and 1/4" thick. Each end is slightly rounded so that connected cars may be taken around sharp curves. A piece of wood 1/2" high, 1/4" thick and 33/8" long is nailed 1/2" from each end. The body of the car is made of thin wood (cigar boxes are well suited for it), doors and windows being cut out with knife or fretsaw. It is 33/4" high in the centre and 2" high at the ends. When completed, it should fit snugly over the wooden pieces nailed to each end of the floor, to which it may be attached with small screws. It should not be permanently fastened as it will have to be frequently removed so that the interior fittings may be inspected or repaired.

Model Electric Railway 310

Fig. 3.

A small motor may be purchased or made. If purchased, the base which usually forms a part of small motors, should be removed and the motor then firmly screwed to the floor of the car. To the shaft, fit a wooden pulley with a face about 3/8" wide. A good one may be made of a button hole twist spool. A flat rubber band is used for a belt which will run well on a spool pulley as described. Obtain the works of a small clock; strip it of all gears and other parts except the gear on the shaft carrying the hands and the large one connected with it. A pinion will usually be found in such a clock which will mesh all right with the large gear of the works, and this pinion should be placed on the axle of the wheels underneath the works, after the works have been correctly located. On the shaft carrying the hands fasten another spool pulley similar to the first. The works are then placed so that the two pulleys will be in line and the big gear mesh in the pinion on the axles. The floor of the car will have to be cut out to allow the works to be set low enough to reach the pinion on the axle. The proper posi tion being ascertained, fasten the works to the floor with round-head screws and washers. The object of having these gears between motor and axle is, the speed of the motor shaft is so much greater than the required speed of the axles of the car that, if belted direct, the belt would slip and make considerable trouble or the car run too fast to stay on the track.