The Mechanical Miners' Guide

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Wire and Wire Rope Works, 1873 - 52 pagina's
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Pagina 37 - In this way, angels may be changing places from a higher to a lower, or from a lower to a higher...
Pagina 41 - Measure the depth (of the vessel, &c.) in feet, extract the square root of that depth, and multiply it by 5.4, which gives the velocity in feet per second ; this multiplied by the area of the orifice in feet, gives the number of cubic feet which flows out in one second. EXAMPLE. Let a sluice be 10 feet below the surface of the water, its length 4 feet, and open 7 inches ; required the quantity of water expended in one second ? x/10=3.
Pagina 16 - Multiply the number in the table by the breadth and square of the depth in inches, and divide the product by the length in feet : the quotient will be the weight, in pounds.
Pagina 17 - When the Bar or Beam, is Fixed at both Ends, and Loaded in the Middle. RULE. — Multiply the Value in the preceding table by six times the breadth, and the square of the depth, in inches, and divide by the length in feet.
Pagina 18 - To find the Diameter of a Solid Cylinder to support a given weight in the middle.
Pagina 15 - ... as the square of the depth multiplied by the breadth and divided by four times the length.
Pagina 15 - ... upon any section is directly as the distance of the weight from that section. The strength of a projecting beam is only one fourth of what it would be if supported at both ends, and the weight applied in the middle. The strength of a projecting beam is only one sixth of one of the same length, fixed at both ends, and the weight applied in the middle.
Pagina 33 - ... under all circumstances of weather, with great depths of snow on the ground, during heavy storms and freshets. It can run constantly without rest; as well during a dark night as a clear day. It can cross deep gorges and chasms. It can pass around precipitous bluffs and perpendicular cliffs. The rope can never leave the posts or sheaves. It can furnish and transmit power, when there is sufficient descent, by its own gravitation, or by an engine attached to either end. It can be constructed and...
Pagina 23 - ... ton. 18 cubic feet of gravel or earth, before digging = 27 cubic feet when dug. 20 cubic feet of quartz broken (of ordinary fineness coming from the hole) = r ton contract measurement.
Pagina 17 - When the Bar or Beam is Supported at both Ends, and Loaded in the Middle. RULE.— Multiply the Value in the preceding table by the square the depth, and four times the breadth, in inches, and divide the product by the length in feet.

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