Erecting and Operating: An Educational Treatise for Constructing Engineers, Machinists, Millwrights and Master Builders

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T. Audel, 1907 - Civil engineering - 583 pages

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Page 23 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Page 22 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 333 - To determine the diameter of Driver, the diameter of the Driven and its revolutions, and also revolutions of Driver being given. Diameter of Driven x revolutions of Driven ._ . . ^ . =- = — : . =Diam. of Driver Revolutions of Driver To determine the diameter of Driven, the revolutions of the Driven, and diameter and revolutions of the Driver being given.
Page 307 - If possible to avoid it, connected shafts should never be placed one directly over the other, as in such case the belt must be kept very tight to do the work.
Page 307 - In the location of shafts that are to be connected with each other by belts, care should be taken to secure a proper distance one from the other. It is not easy to give a definite rule as to what this distance should be.
Page 21 - Friction is that force which acts between two bodies at their surface of contact so as to resist their sliding on each other, and which depends on the force with which the bodies are pressed together.
Page 550 - ... from 20 to 40 per cent, according to speed and other conditions. To find the capacity of a cylinder in gallons: Multiplying the area in inches by the length of stroke in inches will give the total number of cubic inches ; divide this amount by 231 (which is the cubical contents of a gallon of water) and quotient is the capacity in gallons.
Page ix - One of the clerks will become a partner and make a fortune; one of the compositors will own a newspaper and become an influential citizen; one of the apprentices will become a master builder; one of the young villagers will get a handsome farm and live like a patriarch — but which one is the lucky individual?
Page 24 - Although extension and impenetrability are said to be the essential properties of matter, because they are inseparable from its very existence, yet there are also several other properties which are known by experience to belong to all matter, as gravity, inertia, and divisibility; and others still which belong not to matter universally, but only to certain classes of bodies, as elasticity, or the power a body has of recovering itself when compressed ; malleability, or the power of being extended...
Page 22 - Every load which acts on a structure produces a change of form which is termed the strain due to the load. The strain may be either a vanishing or elastic deformation, that is, one which disappears when the load is removed ; or a permanent deformation or set, which remains after the load is removed. In general, machine -parts must be so designed that, under the maximum straining action, there is no sensible permanent deformation.

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