| 摘要 |
A prime mover has a tubular metal member of substantial length which, when both its exterior and its interior are subjected to a heating and cooling cycle, produces work strokes of substantial force, but too short to accomplish a wanted work. A mechanism connected to at least one end of the tubular member converts the short work strokes into strokes of increased lengths with a proportional decrease in force, but with the resulting work stroke lengths and force adequate to accomplish the wanted work.
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