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

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absolute pressure angular velocity approximate avoirdupois axis beam breadth British Measures calculate centre of gravity centre of magnitude centre of pressure chain circle circular arc circular sector co-efficient common logarithm cotan coversin cross-section cube cubic foot curvature curve cylinder denote depth diameter direction divide draw engine equal factor of safety Fahr feet per second figure force formula fraction given number greatest heat horizontal hyperbolic logarithm intervals kilogramme length lines of resistance load mean mean effective pressure metre modulus moment of inertia multiply parallel perpendicular distance plane proportional quotient radius ratio Reciprocal resultant Rule IV.—To sectional area side sine slope spandril specific gravity spherical excess square foot square inch station-line steam straight line subtract surface Table tangent temperature theodolite thickness thrust triangle unit versin vertical volume weight wheel

### Popular passages

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 63 - 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 245 - XVI. — To reduce the inertia or mass of a machine to the driving point. Multiply the weight of each moving portion of the machine by the square of the ratio of its velocity to the velocity of the driving point ; and add together the products; the sum will be the weight of the mass which, if concentrated at the driving point, would require the same force to produce a given change in its speed, in the course of a given time or of a given motion, that is required by the actual machine.

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 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 THE INTENSITY OP PRESSURE. 121

Page 297 - ... 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...

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 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 123 - 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.