A Treatise on the Cornish Pumping Engine, Teile 1-3

J. Weale, 1844 - 236 Seiten

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Seite 179 - A mechanical agent is thus said to work when a pressure is continually overcome, and a point (to which that pressure is applied) continually moved by it. Neither pressure nor motion alone is sufficient to constitute work; so that a man who merely supports a load upon his shoulders, without moving it, no more works, in the sense in which the term is here used, than does a column which sustains a heavy weight upon its summit.
Seite 178 - English writers the various names of " dynamical effect," "efficiency," "work done," "labouring force," " work," &c. ; and " moment d'actlvite"," " quantite d'action," "puissance mecanique," " travail," from French writers. Among the latter this variety of terms has at length given place to the most intelligible and the simplest of them, " travail." The English word " work " is the obvious translation of " travail," and the use of it appears to be recommended by the same considerations.
Seite 6 - The Miner's Friend, or an Engine to Raise Water by Fire, described, and of the manner of fixing it in Mines, with an account of the several uses it is applicable unto ; and an answer to the objections made against it. By Tho. Savery, Gent.
Seite 154 - ... erected and used for supplying water to the metropolis. The following extract will explain the circumstances under which it was introduced : — "In the spring of 1835, the directors of the East London Water- Works Company, contemplated making very considerable alterations in one of their engines at Old Ford ; and it was then suggested by Mr. Grout, one of the directors, that instead of altering the engine in question, it should be taken down, and a Cornish engine erected in its place ; and he...
Seite 40 - Watt formulated the idea of a separate condenser, and the patent for this 'new Method of Lessening the Consumption of Steam and Fuel in Fire Engines
Seite 15 - Majesty that it may be enacted ; and be it enacted by the King's most Excellent Majesty, by and with the Advice and Consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the Authority of the same, That from and after the Twenty-fourth Day of June One thousand seven hundred and seventy-seven, if any Engraver, Etcher, Printseller.
Seite 212 - The instrument, when put in order, was first tried at King's College, a variable motion being given by a small carriage made to descend an inclined plane. The correspondence of the velocity shown by the machine, with that deduced by the known laws of dynamics, was such as to give great confidence in its accuracy ; and after a few minor alterations suggested by frequent trials, it was removed to the East London Water Works, Old Ford, and, by the kind permission of Mr. Wicksteed, the engineer, was...
Seite 5 - I believe it may be made very useful to ships, but I dare not meddle with that matter; and leave it to the judgment of those who are the best judges of maritime affairs;" and he further remarks, " As for fixing the Engines in Ships, when they 1698.
Seite 31 - ... of classical literature ; the most abstruse branches of science, and the niceties of verbal criticism. There was one quality in Mr. Watt which most honourably distinguished him from too many inventors, and was worthy of all imitation, — he was not only entirely free from jealousy, but he exercised a careful and scrupulous self-denial, and was anxious not to appear, even by accident, as appropriating to himself that which he thought belonged to others.
Seite 46 - ... chaldrons of coal in one day. The pit-work, too, which consisted of leathern buckets with two or three pistons, such as were at that time in general use for plungers, was in a very bad state; and it may be safely asserted that the engines were idle at least one-third of the time, for the purpose of repairing the pit-work and changing the buckets. "After he had assumed the management, Captain Lean's attention was immediately directed to the pit-work, and here he first introduced (what is now so...

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