nd valve will be seen by means of Figs. 4, 5, 6, revolution is now complete, and this process is re- its two sides. < At Fig. 8 the piston a has been forced peated at each, revolution. In practice, this revolu- 7, 8, 9, 10 and 11. The circular diagram over each tp,?tb# end of its Stroke by the… … of motion, absence of percussions, the use of only one and the arrows indicate the direction in which the wheel, against the increasing pressure of the air within-, valve, and the protection of the heating surface from pistons are moving. In Fig. 4 the piston has com- which pressure acts the same…
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