| E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898. |
| | | Idle Wheel. | | |
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The middle of three wheels, which simply conveys the motion
of one outside wheel to the other outside wheel. | 1 |
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Suppose A, B, C to be three wheels, B being the idle or gear wheel. B simply conveys the motion of A to C, or of C to A. |
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