The Relative Proportions of the Steam-engine: Being a Rational and Practical Discussion of the Dimensions of Every Detail of the Steam-engineJ.B. Lippincott, 1887 - 283 páginas |
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The Relative Proportions of the Steam-Engine. Being a Rational and Practical ... William Dennis Marks Vista previa limitada - 2024 |
Términos y frases comunes
40 per minute angle assumed b₁ boiler boiler-pressure bolt cast iron centre line centrifugal force centrifugal governor cloth coefficient coko compression condensing cylinder connecting-rod constant crank crank-pin crank-shaft cross-head cross-section curve d₁ d₂ diagram diameter equal equation Example.-Let expansion factor of safety feet per second flexure fly-wheel formula 17 friction gives governor greater heat inch of projected increase indicated horse-power indicator diagram length maximum mean mean effective pressure Mechanics of Engineering modulus of elasticity motion non-condensing cylinder number of strokes piston piston-head piston-rod point of cut-off pounds per square practical proportions radius S₁ shaft shearing strength sin² speed square inch steam-cylinder in inches steam-engine steam-pressure steel strain strength stress strokes per minute Substituting in formula surfaces temperature thickness tion torsion uniform v₁ valve valve-motion velocity w₁ weight Weisbach's Mechanics wrought iron πα
Pasajes populares
Página 6 - In physical science a first essential step in the direction of learning any subject is to find principles of numerical reckoning and methods for practically measuring some quality connected with it. I often say that when you can measure what you are speaking about and express it in numbers, you know something about it ; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...
Página 6 - ... engines of larger dimensions. It was also ascertained, that unless the temperature of the cylinder itself were reduced as low as that of the vacuum, it would produce vapour of a temperature sufficient to resist part of the pressure of the atmosphere. All attempts, therefore, to...
Página 6 - ... the engine would work regularly with a moderate quantity of injection. It now appeared that the cylinder of the model, being of brass, would conduct heat much better than the cast-iron cylinders of larger engines, (generally covered on the inside with a stony crust,) and that considerable advantage could be gained by making the cylinders of some substance that would receive and give out heat slowly.
Página 6 - ... diameter). By blowing the fire it was made to take a few strokes, but required an enormous quantity of injection water, though it was very lightly loaded by the column of water in the pump. It soon occurred that this was caused by the little cylinder exposing a greater surface to condense the steam than the cylinders of larger engines did in proportion to their respective contents.
Página 5 - The attention necessary to the avocations of business prevented me from then prosecuting the subject further, but in the winter of 1763-4, having occasion to repair a model of Newcomen's engine belonging to the Natural Philosophy class of the University of Glasgow, my mind was again directed to it. At that period my knowledge was derived principally from Desaguliers, and partly from Belidor.