Fig. 2. — One of the earliest of induction motors. Although it weighed only a little over 20 pounds, it developed 1/4 horse-power at a speed of 1,800 revolutions, a performance considered remarkable at the time.
Fig. 11. — Photograph of an active terminal of an improved oscillator, used in tesla's experiments for transmitting electrical energy to great distances without wires — Width of illuminated space is 18 feet — The pressure on the terminal is about eight million volts.