A simple electric engine may be made as follows: Take an ordinary electric bell and remove the gong. The striker arm should be cut off about 3/4 inch from the armature leaving the butt G. A strip of brass 1/16 inch thick and 1/4 inch wide of suitable length is bored at both ends, one end to fit the butt G and the other end to fit the crank J of the shaft C. The shaft is made of 1/8-inch diameter brass or steel - care should be taken to make the stroke of the crank / the same as that of the armature.

The balance wheel A is fastened to the shaft C. Any wheel of suitable size and weight can be used. In the model made by the writer a valve wheel 2 inches in diameter was used.

The bearings B can be made of strip brass - in the model screw eyes were used. K K are wire rings soldered to the shaft C to keep it in place. H is a wire ring soldered to the crank to keep the strip F in place. When the screw E is properly adjusted and the terminals L are connected to a battery the engine will run at a high rate of speed.

Fig. 207 - A simple electric engine.