each of two cones, whose effective diameter can be changed so that the "V" belt runs nearer the spindle or nearer the rim, depending on the separation of the cones. These are synchronized so that the belt always remains at the same optimal tension.

History

Patented by Milton Reeves in 1889 in the USS and in Fouillaron in 1898. "To solve a thorny weaving problem, the engineer developed a variator system that prevented the thread from cutting when starting the looms".

In 1904, the Fouillaron type G tonneau

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