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 598 - 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 373 - A machine is a combination of resistant bodies so arranged that by their means the mechanical forces of nature can be compelled to do work accompanied by certain determinate motions.
الصفحة 123 - ... 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 381 - ... 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 481 - Common (see 1 in... 2 in 3 in 4 in... 5 in... 6 in... 7 in... 8 in... 9 in... 10 in... 11 in 12 in 13 in 14 in...
الصفحة 385 - 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. In harder materials, the length may be 4 or 5 times the depth. The breadth in soft material may range from 1 J times to double the depth : in hard materials it may be 3 times the depth.
الصفحة 435 - 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 437 - 14,000 i inch to | inch, . . . 17,000 " 18,000 The head of the water in pounds avoirdupois, multiplied by the diameter of the pipe in inches and divided by the above coefficients, gives twice the thickness of the iron to be used. Allowance must be made for the security required, that is, if the breakage of the pipe will cause much damage it is advisable to lower the margin for greater safety. The diameter of the rivets usually used are: No.
الصفحة 445 - There are various sizes of it used, from one-fourth to 2 inches broad in the blade, and 3 inches long generally. The purpose of the trowel is to clean away and smooth down the surface of the sand, to press down and polish the blackening, repair injured parts of the moulding, and so on.
الصفحة 70 - ... the specific gravity of each ingredient by the difference between it and the specific gravity of the compound. As the sum of the products is to the respective products, so is the specific gravity of the body to the proportions of the ingredients ; then as the specific gravity of the compound is to the weight of the compound, so are each of the proportions to the weight of its material. — The following table presents the specific gravities of substances most likely to be referred to, collected...

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