In 1921, the Seattle Times and the Denver Post, August 8, 1921, wrote about inventions Alfred (Earl) Hubbard also known as SE Amman. His device includes a central core with a coil, around which there are eight field coils. After the initial pulse in the coils alternately generated pulses and creates a rotating magnetic field in the central coil. Power generated in it, is sufficient for self-excitation of the system and carry out useful work. Been demonstrated boat and a car with an electric motor, power generator provided by Hubbard.

Electric engine, 35 hp was attached to the transformer Hubbard, who has perhaps 12- 14 inches (~ 30- 36 cm ) in diameter and 14 inches ( 30 cm ) long. This ustoystvo betrayed enough energy to move a boat with good speed. The demonstration lasted several hours and made a sensation. The test required a large enough power for a long enough time to eliminate the use of any batteries deployed in the device.

From this test, we can make some assumptions. Frequency, probably 50 or 60 Hz. There are also engines of 25 Hz, but it is unlikely that the motor boat has been altered under any higher frequency. Working frequency network in the U.S. – 60Hz.

Voltage could be 440 or 220 volts (probably 220 watts). It is unlikely that the engine is 35 hp would have a voltage below 110 Tues This would require more current and large losses in the coil and wires. It is possible that voltage could be 600 or 1000 volts.

In the end, it does not matter exactly what the operating voltage was used. Depends on that only the required amperage, but the total power still remained to be the mark of not less than 35 hp (25760 W or 25.7 kW of power). This is quite a significant power and mystery the way it is received in the generator Hubbard. ” For comparison, modern lead-zinc car battery has a capacity of 55 Ampere / hour at 12 volts, thereby gaining the power to 660 watts for an hour. Engine capacity of 25,7 kW spent not less than 40 batteries per hour worked. Tests also lasted several hours and the size of “transformer Hubbard was comparable with the one battery. That is why the use of a battery could be no question.