Every boy's book of railways and steamships (1911)
Protheroe, Ernest · London : Religious Tract Society · leaf 314
the vanes and wheels increase in size,and so the expanding steam finds a greater surfaceupon which to exert its force; and steam whichenters the cylinder at a pressure of 200 lbs. persquare inch, leaves it at a velocity of about three-quarters of a mile a second, or quite two-thirds ofthe speed of…
Railroads · Steamboats
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