Useful Rules and Tables Relating to Mensuration, Engineering, Structures, and Machines

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C. Griffin, 1872 - Engineering - 312 pages
 

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Page 59 - 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.
Page 271 - ... stream relatively to the ship in knots; the real slip, or part of that speed which is impressed on that stream by the propeller, also in knots ; and the constant 5-66/or sea-water, or 5-5 for fresh water.
Page 143 - ... 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
Page 160 - Each of the three forces is equal and opposite to the resultant of the other two; and each pair of forces are equal and opposite to the components of the third. Hence this rule serves to resolve a given force into two parallel components acting in given lines in the same plane.
Page 245 - ... 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...
Page 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...
Page 252 - Rankine also states that in ordinary cases the velocities may be taken as bearing to each other nearly the proportions of 3, 4 and 5. In very slow currents they are nearly as 2, 3 and 4.
Page 116 - 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...
Page 201 - 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.
Page 269 - The hydraulic ram is used where a considerable flow of water with a moderate fall is available, to raise a small portion of that flow to a height exceeding that of the fall. The following are rules given by...

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