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Updated: May 24, 2025
Mile after mile; it seemed hours up there in the solitude. I watched the regular dancing up and down of the valves on top of the engine. I was thinking of a tune that would fit to the regular beat of the tappets. I shouted through the 'phone. No answer. He must be too cold to speak, I thought. For myself, I did not know whether I had jaws or not.
In another steam vessel I fitted the same species of valve, but the motion was not derived from tappets, but from a moving part of the engine, though at the moderate speed at which these engines worked I found tappets to operate well and make little noise.
The valve spindle was hollow, and a prolongation of the screw passed up through it, and was armed on the top with a small wheel, by means of which the plates might be adjusted while the engine was at work. In 1839 I fitted an expansion valve in a steam vessel, consisting of two plates, connected by a rod, and moved by tappets up against the steam edges of the valve.
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