Practical Electrics

To those experimenters having only a small spark coil (mine is a 1/4-inch Ford ignition coil) and wishing to produce High Frequency currents, I describe here a coil I made which proved very...

By Curtis Kissel Many Tesla and Oudin coils which are mechanically and electrically correct will not always develop the efficiency or rating expected of them by the constructor. The writer found that...

The main part of this clock is a copper disk perfectly balanced in a solution of copper sulphate and sulphuric acid. The disk is fastened on an axle, the latter being horizontal and free to rotate. On...

A Tesla coil is an interesting piece of apparatus, and with its aid many wonderful experiments can be performed. The apparatus shown here is a rather small one, but will give good results with a one...