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A tonewheel or tone wheel is a simple electromechanical apparatus used for generating electric musical notes in electromechanical organ instruments such as the Hammond organ and in telephony to generate audible signals such as ringing tone. It was developed by Thaddeus Cahill for the telharmonium c. 1896 and patented in 1897.
Hammond was inspired to create the tonewheel or "phonic wheel" by listening to the moving gears of his electric clocks and the tones produced by them. He gathered pieces from a second-hand piano he had purchased for $15 and combined it with a tonewheel generator in a similar form to the telharmonium, albeit much shorter and more compact.
Tonewheel organs. Tonewheel organs generate sound by shaped mechanical wheels, that rotate in front of electromagnetic pickups. Each tonewheel assembly creates tones with low harmonic content, close to a sine wave. Inside the coil is a permanent magnet.
May 25, 2016 · Tone Wheel. Support HammondWiki. Donate! Each tonewheel is a disc of soft iron with a diameter of approximately 2 inches. The rim of the disc is "hobbed" or cut with a specific number of smooth, rounded bumps or "teeth". As the disc rotates, this alternation of the radius leads to a modulation of the magnetic field of the Magnet and Coil pickup ...
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Dec 30, 2021 · The Tonewheel Generator. The magic of a real Hammond tonewheel organ lies in how it’s able to produce sound. Developed by American inventor, Laurens Hammond (1895-1973) who died with no less than one-hundred-and-ten patents to his name, including the iconic red and green cardboard 3D glasses of fifties fame.
This shape generates a "complex tone comprising a fundamental (f) and a series of odd harmonics of progressively decreasing amplitude, namely 1/3 (3f), 1/5 (5f), 1/7 (7f), 1/9 (9f), 1/11 (11f), etc." The resulting output from each of these first 12 tonewheels is very similar to the shape of a square wave. In patent 2,508,514, granted 23 May ...
