The Hammond Organ (1935)
The Hammond Organ model B3 c1950
The original Hammond Organ was Designed and built by the ex-watchmaker Laurens Hammond in April 1935. Hammond set up his 'Hammond Organ Company' in Evanston, Illinois to produce electronic organs for the 'leisure market' and in doing so created one of the most popular and enduring electronic instruments ever built.
Hammonds machine was designed using technology that relates directly to Cahill's 'Telharmonium' of 1900, but, on a much smaller scale. The Hammond organ generated sounds in the same way as the Telaharmonium, the tone weel-The tone generator assembly consisted of an AC
synchronous motor connected to a geartrain which drove a series of
tone wheels, each of which rotated adjacent to a magnet and coil
assembly. The number of bumps on each wheel in combination with the
rotational speed determined the pitch produced by a particular tone
wheel assembly. The pitches approximate even-tempered tuning.
A Hammond console organ included two 61-key manuals; the lower, or Great, and upper, or Swell, and a pedal board consisting of 25 keys. The concert models had a 32-key pedalboard. Hammond also patented an electromechanical reverb device using the helical tortion of a coiled spring, widely copied in later electronic instruments.
As well as being a succesful home entertainment instrument, The Hammond Organ became popular with Jazz, Blues and Rock musicians up until the late 1960's and was also used by 'serious' musicians such as Karheinz Stockhausen in "Mikrophonie II"