# A Manual of Machinery and Millwork (Google eBook)

Griffin, 1873 - Machinery - 588 pages

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Page 325 - ... 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 OF PRESSURE. 121 •
Page 324 - 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 323 - ACB, fig. 64, and measure the distances between the points where it cuts the lines of action. 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.
Page 592 - RAGG (Rev. Thomas) : CREATION'S TESTIMONY TO ITS GOD: the Accordance of Science, Philosophy, and Revelation. A Manual of the Evidences of Natural and Revealed Religion ; with especial reference to the Progress of Science and Advance of Knowledge. Revised and enlarged, with new Appendices on Evolution and the Conservation of Energy. Large crown 8vo. Handsome cloth, bevelled boards, 5/- Thirteenth Edition.
Page 391 - A tains a spiral spring, one end of which is attached to the piston or to its rod, and the other to the top of the casing. The indicator piston is pressed from below by the steam, and from above by the atmosphere. When the pressure of the steam is equal to that of the atmosphere, the spring retains its unstrained length, and the piston its original position. When the pressure of the steam exceeds that of the atmosphere, the piston is driven outwards, and the spring comFig.
Page 393 - The mean forward pressure, the mean back pressure, and the mean effective pressure, are found by dividing those three_areas respectively by the volume s A, which is represented by O L. Those mean pressures, however, can be found by a direct process, •without first measuring the areas, viz. : — having multiplied each ordinate, or breadth, of the area under consideration by the proper multiplier, divide the sum of the products by the sum of the multipliers, which process, when the common trapezoidal...
Page 325 - Specific Gravity is the ratio of the weight of a given bulk of a given substance to the weight of the same bulk of pure water at a standard temperature. In Britain the standard temperature is 62° Fahr.
Page ii - A MANUAL OF APPLIED MECHANICS : Comprising the Principles of Statics and Cinematics, and Theory of Structures, Mechanism, and Machines. With Numerous Diagrams.
Page 467 - There are certain appearances •which are characteristic of strong and durable timber, to what class soever it belongs. In the same species of timber, that specimen will in general be the strongest and the most durable which has grown the slowest, as shown by the narrowness of the annual rings. The cellular tissue as seen in the medullaiy rays (when visible) should be hard and compact.
Page 467 - The freshlycut surface of the wood should be firm and shining, and should have somewhat of a translucent appearance. A dull chalky appearance is a sign of bad timber. In wood of a given species, the heavier specimens are in general the stronger and the more lasting. Amongst resinous woods, those which have least resin in their pores, and, amongst non-resinous woods, those which have least sap or gum in them, are in general the strongest and most lasting. Timber should be free from such blemishes...