Appletons' Cyclopædia of Applied Mechanics: A Dictionary of Mechanical Engineering and the Mechanical Arts, المجلد 2

الغلاف الأمامي
Park Benjamin
D. Appleton, 1880
 

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الصفحة 599 - C where their orifices are covered by clacks. Thus when the piston is turned in either direction, it drives the water before it through one or other of these tubes; at the same time the void left behind it is kept filled by the pressure of the atmosphere on the surface of the liquid in which the lower orifice of the suction pipe is placed.
الصفحة 478 - English armaments, and is built upon the Armstrong principle modified and improved by Mr. Frazer, who reduced the cost of the gun as well as the number of parts. These guns have been constructed of various calibres, viz., 7 in., 8 in., 9 in., 10 in., 11 in., 12 in., 16 in. The last named is known as the 81-ton gun, a description of which will suffice to show the method of construction for all sizes. The interior of the gun was formed by a solid-ended steel tube, weighing 16 J tons, and having no...
الصفحة 378 - Notes on Building Construction. Arranged to meet the requirements of the Syllabus of the Science and Art Department of the Committee of Council on Education, South Kensington.
الصفحة 122 - ... opposite sides, we may regard the pressure as applied through the whole breadth of the cylinder upon each lineal unit of the diameter. Hence the total amount of force which would tend to divide the cylinder in halves, by separating it along two lines, on opposite sides, would be...
الصفحة 378 - ... so that the straight joint may not show, but, if it is necessary to bond them together, the new work should be built in a quick-setting cement mortar, and each part of it allowed to set before being loaded. In pointing old masonry, all the decayed mortar...
الصفحة 367 - Suppose we have six varieties of oil to test, and we are desirous to know which of them will for the longest time retain its fluidity when in contact with iron and exposed to the action of the air; all we have to do is to pour out simultaneously at the upper end of each inclined groove an equal quantity of each of the oils under examination. This is very conveniently and correctly done by means of a row of small brass tubes. The six oils then make a fair...
الصفحة 381 - When a stratified stone is placed vertically, and so that the layers of which it is composed are parallel to its face, they are apt to be split off in succession by the action of the weather. Moreover, a stone in this position has not so much strength to resist crushing as it has when placed on its natural bed. In a cornice with overhanging or undercut mouldings the natural bed should be placed vertically and at right angles to the face, for if placed horizontally layers of the overhanging portions...
الصفحة 475 - Muzzleor breech-loading guns having projectiles of hard metal, fitting the peculiar form of the bore mechanically; 2. Muzzle- or breech-loading guns with projectiles having soft-metal studs or ribs to fit the grooves ; 3. Muzzle-loading guns with projectiles having a soft-metal envelope or cup, which is expanded by the gas in the bore ; 4. Breech-loading guns with projectiles having a soft-metal coating' larger in diameter than the bore, but which is compressed by the gas into the form of the bore.
الصفحة 434 - J feet above datum line (100 feet extreme height)* by filling in a stone embankment on the lower side of the old structure, faced with heavy walls of dry rubblestone of large size.
الصفحة 382 - Stones. In order that the stones may not be liable to be broken across, no stone of a soft material, such as the weaker kinds of sandstone and granular limestone, should have a length greater than 3 times its depth or rise; in harder materials the length may be 4 to 5 times the depth.

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