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A Memoir of John Elder: Engineer and Shipbuilder, Glasgow
William John Macquorn Rankine
No preview available - 2015
admission amongst applied Arethusa back-pressure balance of driving boiler Callao carried condensing engine Constance construction consumption of coal Craddock's cube cylinder and piston cylinder engines David Elder direct-acting driving forces driving the piston economy of fuel efficiency Elder—dated Elm Park engined by Messrs engines described equal firm forces exerted form of compound forward pressure friction Funchal given weight Glasgow Govan greater heat high and low high rates improvements indicated horse-power indicated power invention jacket John Elder knots liquid water Little Seggie low pressure cylinders marine engines mean mechanism Memoir Messrs Eandolph millwright Milnathort nautical miles nearly Octavia Pacific Steam Navigation paddle-wheel steamer pair patent piston-rods pound engine power per hour practical principles quantity rate of consumption rates of expansion screw-steamer Sept shaft single-cylinder steam in driving steam-jacket steam-vessels steamers straining actions Suez Canal superheating surface-condenser temperature three-cylindered compound engine tion trial-trip Valparaiso walking-beam waste weight of steam workmen
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 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