Pneumatics: For the Use of Beginners ...John Weale, 1852 - 138 من الصفحات |
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30 inches 30th parallel aërial air-pump anemometer arithmetical progression ascending atmospheric pressure barometer blow bodies bottom bulk carbonic acid cistern coincide cold column of mercury column of water constant contrary cylinder density descends difference diminished direction Drôme earth's surface effect elastic force equal equator exactly expand feet filled fluid gales gauge geometrical progression glass greater half heat height hemisphere inches of mercury increase instrument land breeze latitude length liquid logarithms long con lower current mean measure mercurial column mercury rises metal miles an hour monsoons motion moving Natural Philosophy neutral point number of vibrations Nyons observations oscillations particles pencil piston polar circle produced Professor Daniell proportional quantity rain rise rotatory scale screw sea-level siphon sound southern hemisphere space square inch storms string supposed syringe temperature tion trade-winds tropics tube upper current upwards valve velocity vernier vessel warmer wind
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الصفحة 138 - Illustrated. is 6d 7. ELECTRICITY; showing the General Principles of Electrical Science, and the purposes to which it has been applied. By Sir W. SNOW HARRIS, FRS, &c. With Additions by R. SABINE, CE, FSA is. 6d. 7*.
الصفحة 77 - Mexico, and, by heating the land violently, cause the air to rise over it. But the vacuum is filled up not only from the northward, but by the comparatively cold air of the equatorial regions in the neighbourhood.
الصفحة 24 - The motion of the pistons is effected by means of a short crank with a jointed connecting-rod, converting the circular motion given by the lever handle into a vertical one, which is maintained by means of a cross-head, with rollers working between guides. "The action of...
الصفحة 13 - ... pressures counterbalance each other. In the same manner the fluid atmosphere presses equally in all directions, and the human body immersed in it may be compared to a sponge plunged into deep water ; it is not crushed, because the water fills the cavities of the sponge, and also surrounds it entirely. In like manner our bodies, and even our bones, are filled either with liquids capable of sustaining pressure, or with air of the same density as the external air, so that the outward is counteracted...
الصفحة 46 - Change ;' that rain frequently falls when it stands as high as 30 inches, or 'Fair;' and more particularly in winter, a fine bright day will succeed a stormy night, the mercury ranging as low as 29 inches, or opposite to ' Rain.' It is not so much the absolute height as the actual rising and falling of the mercury, which determines the kind of weather likely to follow.
الصفحة 48 - It will be necessary, on returning the form when filled, to accompany it with the following data for reduction. A blank is left for this purpose on the back of the form. " The geographical co-ordinates of the place of observation, viz. latitude and longitude. " The altitude of the cistern of the barometer above the level of the sea, exactly ; if not, as near as it can be obtained. " The internal diameter of the tube of the barometer.
الصفحة 77 - They blow for nearly six months of the year in one direction, and for the other six in an opposite direction. The Malays call them mooseen, which signifies season.
الصفحة 135 - INTEGRATING ANEMOMETER. A SHEET of plain paper, placed in the instrument, under a registering pencil, is moved forward by rotating, hemispherical fans, at the rate of one inch for every ten miles of air that passes ; this same pencil, having a lateral motion given to it by a vane, records the point of the compass from which the wind blows, and a clock-hammer, descending every hour, strikes its mark on the margin of the paper, to express the time. Thus, in a single line, are given the length of the...
الصفحة 84 - Island on the 13th ; at the Bahamas on the 14th ; on the gulf and coast of Florida on the 15th ; along the coast of Georgia and the Carolinas on the 16th...
الصفحة 78 - When the sun, on the other hand, goes to the south, the same seas are occupied by air which, coming from regions beyond the northern tropic, possesses less easterly velocity than the space they are drawn to, which gives them an easterly character; and this combined with their proper motion, if I may so call it, from the north, produces the north-east monsoon. There are numberless other less striking modifications of these principles, which...