One of the mysteries of the English language finally explained.
An intermediate wheel between two geared wheels, especially when its purpose is to allow them to rotate in the same direction.
- ‘A bearing is adjacent to the idle wheel.’
- ‘On the arbor of the wheel of 57 is a pinion of 16, driving a wheel of 70, on whose arbor is a pinion of 8 driving an idle wheel of 40.’
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