Useful Rules and Tables Relating to Mensuration, Engineering, Structures, and MachinesC. Griffin, 1873 - 312 páginas |
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Términos y frases comunes
angular velocity approximate avoirdupois axis beam breadth British Measures calculate catenary centre of gravity centre of magnitude centre of pressure chain circle circular arc co-efficient common logarithm cotan coversin cross-section cube cubic foot curvature curve cylinder denote depth diameter direction divide draw earth equal factor of safety Fahr figure formula fraction given number greatest horizontal hyperbolic logarithm inches of mercury intervals iron kilogramme length lines of resistance load mean metre mile modulus moment of inertia multiply nearly parallel perpendicular distance places of decimals plane proportional quotient radius ratio Reciprocal resultant RULE sectional area shearing action side sine slope spandril specific gravity spherical excess square foot square inch station-line straight line stress subtract surface T₁ tangent theodolite thickness thrust triangle unit versin vertical weight wheel ΙΟ وو
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Página 61 - To find the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides "by the perpendicular distance between them : the product will be the area.
Página 8 - ... between 1 and 10 is obtained by moving the decimal point of the number (actual or implied) the required number of digits. The power of 10, for a number greater than 1, is positive and is one less than the number of digits before the decimal point in the original number. The power of 10, for a number less than 1, is negative and is one more than the number of zeros immediately following the decimal point in the original number. Hence...
Página 145 - ... the ratio of the mass of a given volume of the substance to the mass of an equal volume of water, in which case it is equal to the specific gravity. In its application to gases, the term THE INTENSITY OP PRESSURE. 121
Página 247 - ... such a soft material could be the means by which tramcars are driven by shearing stresses seems an additional difficulty in the way of this suggestion. Mr. Larmor concludes that the stone support on which the mirrors were borne changed in its dimensions, as it was rotated, by an amount proportional to the square of the ratio of its velocity to the velocity of light, and he justifies this by showing that if matter consists of clusters of electrons, just such a change of dimensions would take place...
Página 299 - ... by the difference between the pressures in the boiler and cylinder, multiply the square root of the quotient by the speed of the piston in feet per minute, and by the square of the diameter of the cylinder in inches, and divide the product by 15000. From this we obtain the proper area of the steam passages for the particular cases that may demand our consideration. For safety take the minimum difference between pressures in cylinder and boiler with maximum pressure in the cylinder. Let the diameter...
Página 162 - Then each force will be proportional to the distance between the lines of action of the other two. The direction of the middle force, C, is contrary to that of the other two forces, A and B.
Página 118 - Then, without moving the vertical circle, direct the telescope towards the star, clamp the vernier-plate, and by the aid of its tangent-screw follow the star in azimuth with the cross wires until it arrives exactly at its former altitude, as is shown by its image coinciding with the cross wires ; then measure the horizontal angle between the new direction of the star and the station-line...
Página 203 - A live load is one that is put on suddenly, or is accompanied with vibration ; such as a swift train travelling over a railway bridge, or a force exerted in a moving machine.
Página 271 - Let Q be the whole supply of water, in cubic feet per second, of which q is lifted to the height h above the pond, and Q — q runs to waste at the depth H below the pond.
Página 125 - To find the sides of a rightangled triangle in whole numbers, take two unequal whole numbers: then the sum of their squares, the difference of their squares, and twice their product will be the three sides.