Elements of Mechanism: Elucidating the Scientific Principles of the Practical Construction of Machines. For the Use of Students in Mechanical Engineering. With Numerous Specimens of Modern MachinesJ. 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 circumference conical surfaces cord crank crown-wheel curve cylinder descends described diameter direction distance driving engine equa equal equation excentric feet fixed fly-wheel force frame friction frustums fulcrum gear girders 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 plate pressure produced Prof pulley pump rack radii radius raised ratchet-wheel reciprocating motion revolve roller rope round screw shaft shown side slide space spindle spur-wheel steam steam-engine sugar surface threads tons tooth train tube turned valve velocity ratio vertical weight wheel whence Willis's Mechanism
Популярні уривки
Сторінка 80 - J will turn the verge in the same direction, until, by the circular motion of A, its extremity is lifted so high that the crown-wheel tooth passes under it, or, in other words, this tooth escapes from the pallet. By the same motion of the verge the pallet...
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 171 - 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 64 - Thence the line follows south of the Benue, the circumference of a circle, the centre of which is the centre of the town of Yola as it existed in 1893, and the radius of which is the distance between the centre of the town of Yola and the point on the left bank of the Benue...
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 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 176 - ... 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 will be produced under the piston in the indicator, and the...
Сторінка 34 - ... 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 the numbers in the two following series are so arranged, that * Willis's Principles of Mechanism,...
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...