| 1. | The gears are usually plain spur gears, running in roller bearings.
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| 2. | The tender wheels were driven by two cylinders via spur gears.
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| 3. | "' Spur gear teeth "'are manufactured by either involute profile or cycloidal profile.
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| 4. | The drive within the casing is provided by a train of spur gears.
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| 5. | If the spur gear fails, the possibility exists for an accompanying engine failure.
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| 6. | "Helical " or " dry fixed " gears offer a refinement over spur gears.
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| 7. | Most common stock gears are spur gears, with straight teeth.
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| 8. | Later designs, particularly those by Abner Doble, preferred spur gears.
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| 9. | This in turn engages a spur gear which is fastened to an actuating lever.
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| 10. | The teeth of spur gears clatter together when the gears spin, generating a characteristic whine.
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