Elements of Mechanism: Elucidating the Scientific Principles of the Practical Construction of Machines: For the Use of Schools, and Students in Mechanical Engineering, with Numerous Specimens of Modern Machines, Remarkable for Their Utility and IngenuityJ. Weale, 1852 - 225 стор. |
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Elements of Mechanism: Elucidating the Scientific Principles of the ... Thomas Baker Повний перегляд - 1852 |
Elements of Mechanism: Elucidating the Scientific Principles of the ... Thomas Baker Повний перегляд - 1852 |
Elements of Mechanism; Elucidating the Scientific Principles of the ... Thomas Baker Попередній перегляд недоступний - 2015 |
Загальні терміни та фрази
angular velocity annexed fig arrangement ascend attached axes axis axle barrel boiler camb cast-iron centre of motion centrifugal force centripetal force chain CHAPTER circumference conical surfaces cord crank crown-wheel curve cylinder descends described diameter direction distance ditto draught driving engine equa equal equation equilibrium excentric feet fixed fly-wheel force formed frame friction frustums fulcrum gear groove gudgeons inches inclined inclined plane lathe length lever machine machinery miles per hour moveable moved number of revolutions number of teeth P's vel parallel motion passing pinion pipe piston pitch circle plane plates pressure produced Prof pulley pump rack radii radius raised ratchet-wheel reciprocating motion revolve roller rope rotation round screw shaft shown side slide space spindle steam steam-engine surface threads tons tooth train tube turned valve velocity ratio vertical vessel weight wheel Willis's Mechanism
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Сторінка 174 - ... that it may be put in communication with the boiler at pleasure. When the stop-cock is open, the steam acting on the mercury in one leg of the gauge presses it down, and the mercury in the other leg rises. The difference between the two columns is the height of mercury which corresponds to the excess of the pressure of the steam in the boiler above the pressure of the atmosphere ; or, in other words, to the effective pressure on the safetyvalve.
Сторінка 227 - Practical Mathematics. MATHEMATICS for PRACTICAL MEN ; being a Commonplace Book of Pure and Mixed Mathematics. Designed chiefly for the Use of Civil Engineers, Architects, and Surveyors. Part I. PURE MATHEMATICS — comprising Arithmetic, Algebra, Geometry, Mensuration, Trigonometry, Conic Sections, Properties of Curves. Part II. MIXED MATHEMATICS — comprising Mechanics in general, Statics, Dynamics, Hydrostatics, Hydrodynamics, Pneumatics, Mechanical Agents, Strength of Materials...
Сторінка 170 - By using the centre die every description of flat or circular work can be riveted, and by selecting those on the sides it -will rivet the corners, and thus complete vessels of almost every description. This machine is of a portable form, and can be moved on rails to suit the article suspended from the hook. This machine fixes in the firmest manner, and completes 8 rivets of f-inch diameter in a minute, with the attendance of two men and two boys ; whereas the average work that can be done by two...
Сторінка 34 - ... of an inch in 3 inch pitch by always taking the nearest number in the manner directed, and a proportionably smaller error in smaller pitches. But to ensure this, the selected numbers should be so taken, that their respective forms shall lie between the extremes at equal distances. Now it appears that the variation of form is much greater among the teeth of small numbers than among the larger ones, and that in fact GUDGEONS.
Сторінка 171 - ... and a boy, is 40 J-inch rivets per hour ; the quantity done in the two cases being in the proportion of 40 to 480, or as 1 to 12, exclusive of the saving of one man's labour. The cylinder of an ordinary locomotive-engine boiler...
Сторінка 117 - ... and the friction of the wheel on its axis ; and, where a large quantity of water is to be raised to a moderate height, both of these resistances may be rendered inconsiderable.
Сторінка 140 - Boyden's wheel). (3). That they will work at very different velocities above or below that corresponding to the maximum effect, without the useful effect varying materially from that maximum. (4). That they will work from one to two yards deep under water, without the proportion which the useful effect bears to the total force being sensibly diminished. (5). In consequence of the...
Сторінка 115 - MN from its greatest elevation, the increased elasticity of the air in the body of the pump will keep the valve at c closed and open that at H, whence air will escape. By similar ascents and descents of the piston the air will be expelled and water rise into the body of the pump. The descending piston will then press the water through the valve at H, which will close and prevent its return into the body of the pump. The ascents and descents of the piston, being thus continued, will raise the water...
Сторінка 228 - VALUING ARTIFICERS' WORKS ; containing Directions for taking Dimensions, Abstracting the same, and bringing the Quantities into Bill, with Tables of Constants, and copious Memoranda for the Valuation of Labour and Materials in the respective Trades of Bricklayer and Slater, Carpenter and Joiner, Painter and Glazier, Paperhanger, &c.
Сторінка 176 - When both extremities of the cylinder are open to the atmosphere, the spring is at rest, and the piston in the middle of the cylinder ; but when steam is allowed to pass from the cylinder to the indicator, by opening the stop-cock d, such steam will press the piston upwards, and compress the spring with a force equal to the excess of the pressure of the steam above that of the atmosphere. When, on the other hand, a vacuum is produced in the cylinder by the condensation of the steam, the same vacuum...