The Mechanics' Magazine and Journal of Engineering, Agricultural Machinery, Manufactures and Shipbuilding, Band 79Robertson, Brooman, & Company, 1863 |
Inhalt
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
aniline applied arrangement axis boiler bolt bottom carriage carried centre chamber coal communication connected construction cylinder Dated December Dated February Dated January December 17 December 24 diameter disc employed engine fabrics February 14 fibrous fire fitted fixed frame furnace grooves gun-cotton gutta percha heat hole hollow horizontal Improvements in apparatus Improvements in machinery india rubber invention consists invention relates inventor iron January 15 January 28 lamp length lever locomotive machine mandril manufacture material means mechanical ments Messrs metal miles motion mould obtained ordinary pass Patent abandoned Patent completed piece pipe piston placed plates present pressure projectile pump purpose R. A. Brooman rail railway ratus rings rollers screw shaft ships side slide speed spindle STAMP DUTY steam steam engines steel substances suitable surface tion tons traction engines tube upper valve vertical vessel weight wheel wire
Beliebte Passagen
Seite 612 - Ib. of coal, yet, if we take the average effect obtained from steam-engines of the various constructions now in use, we shall not be justified in assuming it at more than one-third of that amount. It follows therefore that the average quantity of coal which we expend in realizing a given effect by means of the steam-engine is about 30 times greater than would be requisite with an absolutely perfect heatengine.
Seite 612 - ... for future use. The phase of the earth's existence suitable for the extensive formation of coal appears to have passed away for ever ; but the quantity of that invaluable mineral which has been stored up throughout the globe for our benefit is sufficient (if used discreetly) to serve the purposes of the human race for many thousands of years. In fact, the entire quantity of coal may be considered as practically inexhaustible. Turning, however, to our own particular country, and contemplating...
Seite 612 - A sudden outburst of light, far exceeding the brightness of the sun's surface, was seen to take place, and sweep like a drifting cloud over a portion of the solar face. This was attended with magnetic disturbances of unusual intensity, and with exhibitions of aurora of extraordinary brilliancy. The identical instant at which the effusion of light was observed was recorded by an abrupt and strongly marked deflection in the self-registering instruments at Kew.
Seite 612 - ... the application of electricity as a motive power, we must bear in mind that we shall still require to effect chemical combinations, and in so doing to consume materials. But where are we to find materials so economical for this purpose as the coal we derive from the earth and the oxygen we obtain from the air ? The latter costs absolutely nothing ; and every pound of coal, which in the act of combustion enters into chemical combination, renders more than two and a half pounds of oxygen available...
Seite 623 - By this method it was thought that the degrees of hardness of the steel was capable of being regulated by the size of the granules, and by the quantity of oxides used, but after a great number of experiments, at a cost of little under a thousand pounds, on attempting to work...
Seite 652 - The projection of steam, combined as it necessarily must be with the water, with great velocity and through a greater or less space, upon the upper sides of the shell of the boiler, which is thus forced completely open, and perhaps broken in pieces.
Seite 612 - I can state with perfect confidence that so far as the raising of steam is concerned, the production of smoke is unnecessary and inexcusable. The experiments to which I refer proved beyond a doubt that by an easy method of firing, combined with a due admission of air and a proper arrangement of fire-grate, not involving any complexity, the emission of smoke might be perfectly avoided, and that the prevention of smoke increased the economic value of the fuel and the evaporative power of the boiler.
Seite 612 - That small pencil of solar radiation which is arrested by our planet, and which constitutes less than the 2,000-millionth part of the total energy sent forth from the sun, must be regarded as the power which enabled the plants of the carboniferous period to wrest the carbon they required from the oxygen with which it was combined, and eventually to deposit it as the solid material of coal. In our day, the reunion of that carbon with oxygen restores the energy expended in the former process, and thus...
Seite 678 - Another form of edge-trap is found in Alaska, where the blades are attached to one end of a lever, the other end of which is inclosed in a torsion spring of rawhide. The animal stops to pick the bait pulls the trigger, and releases the unstable hook -catch ; the knives fly over and the victim is brained.
Seite 612 - The sympathy also which appears to exist between forces operating in the sun and magnetic forces belonging to the earth merits a continuance of that close attention which it has already received from the British Association, and of labours such as General Sabine has with so much ability and effect devoted to the elucidation of the subject.