Handy man's workshop and laboratory . clapper. Like allother exhibitions of static electric phenomena, the one jiere de-scribed succeeds best in cold weather, it being practically uselessto expect satisfactory results from it with the atmosphere outsideabove the freezing point, though its action is always very grati-fying at other times. The experiment as here illustrated con-stitutes a very attractive parlor demonstration, which, from itssimplicity of arrangement and certainty of action, is always infavor with the young.—24 HOW TO MAKE A SIMPLE ELECTRIC ENGINE A simple electric engine may be
Handy man's workshop and laboratory . clapper. Like allother exhibitions of static electric phenomena, the one jiere de-scribed succeeds best in cold weather, it being practically uselessto expect satisfactory results from it with the atmosphere outsideabove the freezing point, though its action is always very grati-fying at other times. The experiment as here illustrated con-stitutes a very attractive parlor demonstration, which, from itssimplicity of arrangement and certainty of action, is always infavor with the young.—24 HOW TO MAKE A SIMPLE ELECTRIC ENGINE A simple electric engine may be made as follows: Take anordinary electric bell and remove the gong. The striker armshould be cut off about ^4 incn from the armature leaving thebutt G. A strip of brass 1/16 inch thick and yi inch wide ofsuitable length is bored at both ends, one end to fit the butt Gand the other end to fit the crank / of the shaft C. The shaft ismade of J^-inch diameter brass or steel—care should be taken 250 HANDY MAN S WORKSHOP AND LABORATORY. Fig. 207—A simple electric engine to make the stroke of the crank / the same as that of the arm-ature. The balance wheel A is fastened to the shaft C. Any wheel of suitable size and weight ? /L*—\ can be used. In the model made by the writer a valvewheel 2 inches in diameterwas used. The bearings B can bemade of strip brass—in themodel screw eyes were are wire rings solderedto the shaft C to keep it inplace. H is a wire ringsoldered to the crank to keepthe strip F in place. When the screw E is properly adjusted andthe terminals L are connected to a battery the engine will run ata high rate of speed.—12 A SIMPLE MEDICAL COIL Doubtless there are many persons who would like to make aninduction coil for medical use, but are deterred from so doing bythe belief that the work is too difficult for any one but a skilledmechanic to undertake. This is a great mistake, however, as itis quite possible for almost anybody to make a coil that will
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