Pneumatics: For the Use of Beginners ...

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Сторінка 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*.
Сторінка 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.
Сторінка 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...
Сторінка 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...
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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...
Сторінка 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...
Сторінка 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...

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