| 21. | There are bevel gears driving coaxial contra-rotating double 4 blades screws to propel torpedo running straight under the water.
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| 22. | The most familiar kinds of bevel gears have pitch angles of less than 90 degrees and therefore are cone-shaped.
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| 23. | However, having inherited some worm-gear machinery from Lanchester Motors, BSA opted to specify worm drive rather than bevel gears.
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| 24. | Examples of such sections are the transverse section of bevel gear teeth and the normal section of helical teeth.
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| 25. | For a shaft-driven bicycle the gear ratio depends on the bevel gears used at each end of the shaft.
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| 26. | It differs from a geared differential by using several small ball bearings rotating between two plates, instead of bevel gears.
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| 27. | The overhead camshaft is driven by a vertical shaft through bevel gears, which also forms the armature of the dynamo.
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| 28. | The engines had separate cylinders on the crankcase and an overhead camshaft driven by a vertical shaft and bevel gears.
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| 29. | These engines had bevel gear shaft drive to the overhead camshaft, and were produced in round, square, and Mille crankcases.
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| 30. | Instead of the usual chain drive, the Century steamer employed shaft drive and a bevel gear drive, a very modern solution.
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