A Memoir of John Elder, Engineer and Ship-builder

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W. Blackwood, 1871 - 79 pages
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Page 65 - not make his judgment blind ; He faced the spectres of the mind, And laid them : thus he came at length To find a stronger faith his own ; And power "was with him in the night, Which makes the darkness and the light, And dwells not in the light alone.
Page 65 - in deeds, At last he beats his music out ; There lives more faith in honest doubt, Believe me, than in half the creeds. He fought his doubts and gathered strength ; He
Page 22 - means combined. The steam is thus kept in a nearly dry state, so as to be a bad conductor of heat ; and the moisture which it contains, though sufficient to lubricate the piston, is not allowed to increase to such an extent as to carry away any appreciable quantity of heat from the metal of the cylinder and piston to the condensers.
Page 24 - of employing the compound engine is connected with those causes which make the actual indicated work of steam fall short of its theoretical amount, and also with the strength of the engine and its framing, the steadiness of its action, and the friction of its mechanism.
Page 20 - One of the earliest consequences deduced from the principles of thermodynamics was, that when steam performs work by expansion, a quantity of heat disappears sufficient not only to lower the temperature of the steam to that corresponding to its lowered
Page 22 - of the steam during its expansive working, in which the process just described originates ; and that is done either by enclosing the cylinder in a jacket or casing supplied with hot steam from the boiler, or by superheating the steam before its admission into the cylinder ; or by both
Page 47 - The superior economy of fuel, as compared with indicated power, in the Constance is, of course, to be accounted for by a higher initial pressure and a greater rate of expansion than those used in the other vessels, combined possibly with better jacketing and greater superheating.
Page 33 - The engines are vertical, direct-acting, and geared. The pistons of the high and low pressure cylinders move in contrary directions, and drive diametrically opposite cranks, with a view to
Page 17 - It is obvious that work continues to be done by the steam in driving the piston so long as the pressure behind the piston, or forward pressure, continues to be greater than the pressure in front, or
Page 14 - For example, the expenditure of heat required to produce a given weight of steam at the pressure of

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