There are three Li ting - typical methods: (I) A direct pull may be applied to the hook, either by screws, or by a cylinder fitted with is piston and rod and actuated by direct hydraulic or other pressure, as shown diagrammatically in fig. [Please select]
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132 represents a cylinder (D) with a vertically movable piston (E) and a standpipe (F). [Please select]
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An engine of this type is called double-acting, as the piston is pushed alternately backwards and forwards by the steam. [Please select]
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The power of one piston is constantly increasing while that of the other is decreasing. [Please select]
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Round it are white grooves, R R, in which rings are fitted to prevent the passage of steam past the piston. [Please select]
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In our illustration the piston has just begun to move towards the right. [Please select]
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_Reciprocation_ is this backward and forward motion of the piston: hence the term "reciprocating" engines. [Please select]
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