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| | John Greschak - Tempo Scales in Polytempo Music: A Survey |
 | | In 1815, Johann Nepomuk Maelzel patented a mechanical device that he called the "metronome" that could be used to indicate various musical tempi. |
 | | For this device, Maelzel established a scale of tempi that consisted of the following rates (beats per minute): 50, 52, 54, 56, 58, 60, 63, 66, 69, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 126, 132, 138, 144, 152 and 160. |
 | | Later, in the 1820's, Maelzel extended the lower and upper limits of this scale to include the following rates: 40, 42, 44, 46, 48, 168, 176, 184, 192, 200 and 208. |
| www.greschak.com /polytempo/ptts.htm (3001 words) |
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