A compendium of mechanics; by Brunton Robert 1796-1852

Author:Brunton, Robert, 1796-1852. [from old catalog] & Readwick, James, 1790-1863, [from old catalog] ed
Language: eng
Format: epub
Tags: Mechanical engineering
Publisher: New York, G. & C. & H. Carvill
Published: 1830-03-25T05:00:00+00:00

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EXAMPLE.

Required the weight of a fly-wheel proper for an Sngine of 20 horse-power, 18 feet diameter, and Yuaking 22 revolutions per minute?

18 feet diameter = 56 feet circumference, x 22 revolutions per minute = 1232 feet, motion per minute -s- 60 = 20^ feet motion per second; then 20i« = 420i the divisor.

20 horse power x 2000 = 40000 dividend.

40000 ^^ . » ^ *

j^2Qi = ^•^ cwt. weight of wheel.

Parallel Motion. —The radius and paralld bars ai^ of the same dimensions; their length being genially l-4th of the length of the beam between th6- two glafids, or one-half 6f the distance between die fulcrum and. gland. Both paii^s of strapi are the same length between the centres, and which is generally three inches less than the half of the length of stroke* See Plate Bd.

Gov£RMOB, or Double Pendulum. —'If the revolutions be the same, whatever be the length of the arms^ the balls will revolve in the same plane, and the distance of that plane from the point of-suspension, is equal to the length of a peiiidulum, the vibriaticHis of which will be double the revolutions of the balls. Foe example; sifppose the distaroe betweei!! the point of susj^nsion and pUfie of revolution be S^

L 3

inches, the vibrations that a pendulum of 36 inches

375

will make per minute, is=-^o^ = 62 vibrations, and

62

— = 31 revolutions per minute the balls ought to

make.

WATER WHEEL.

This subject belongs to Hydrodynamics, also the common and force Pumps; and since they are the last of this Treatise, they may be classed under that name, to distinguish them from the preceding subjects in Statics and Dynamics.

Water. (Hydrostatics.)

Hydrostatics is the science which treats of the pressure, or weight, and equilibrium of water, and other fluids, especially those that are non-elastic

Note 1. The pressure of water at any depth, is as its depth; for the pressure is as the weight, and the weight is as the height.

Note 2./ The pressure of water \m a surface any how immersed in it^ either perpendicular, horizon-

tal or obliqae, is equal to the weight of a column of water, the base being equal to the surface pressedf and the altitude equal to the depth of the centre of gravity, of the surface pressed^ below the top or sur&ce of the fluid.

PROBLEM L

In a vessel filled with water, the sides of which are upright and parallel to each other, having the top of the same dimensions as the bottom, the pressure exerted against the bottom, will be equal to the area of the oottom multiplied by the depth of water.

EXAMPLE.

' A vessel, 3 feet square and 7 feet deep, is filled with water; what pressure does the bottom support? 3g X 7 X 1000 _ 393^^ jjjjg Avoirdupois.

PROBLEM IL

A side of any vessel sustains a pressure equal to the area of the side multiplied by half the depth, therefore the sides

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