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Radio Personalities
IV REGINALD AUBREY FESSENDEN
ALTHOUGH radio is but a side issue in the career of Reginald Aubrey Fessenden, inventor of the wireless telephone and radio compass, the smoke cloud for tanks, the electrically driven battleship, and the method of locating enemy guns by sound, and, as en
six inches in outside diameter, giving a quarter horse power at 50,000 cycles and capable of being used as an amplifier with a ratio of 1-30 in current and 1-900 in energy of amplification; and a new type of radio telegraph receiver capable of recording each individual radio wave, thereby eliminating the troublesome static.
Professor Fessenden's radio frequency dynamo. The dyanamo is in the centre and the machines each side of it are
merely employed to drive it. Although it is but six inches in outside diameter, it is capable of delivering j H. P. at 50,000
cycles. This machine is a forerunner of the present day high frequency alternators
gineering commissioner for the Ontario Power Commission, responsible for the mammoth power distribution from Niagara Falls, he has contributed to that science more perhaps than any other one man since the invention of wireless telegraphy.
Among his newest inventions which will soon be available to the average radio enthusiast, are a high frequency dynamo (Photograph D.),only
Photograph A shows such a receiver, and photograph B shows a record of dots made at a frequency of 50,000 cycles per second.
This photograph B is enlarged 2,000 times from the original record of the message, which is micro-photographed on a strip of photo film, moving 2 inches per second developed continuously, or on an 8 in. by 10 in. plate developed hourly. Each plate holds one hour's
B. Record of dots made at a frequency of 50,000 cycles per second received by Professor Fessenden's new type of radio telegraph receiver