Spons' Dictionary of Engineering, Civil, Mechanical, Military, and Naval; with Technical Terms in French, German, Italian, and Spanish, Volúmenes1-2E. & F.N. Spon, 1873 - 768 páginas |
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Términos y frases comunes
acid angle arrangement ashlar attached axis axle beam bearing blow boiler bolts bottom buckets buddle carried cast cast-iron centre circular connected connecting rod crank cubic curve cylinder depth diameter disc distance driving edge engine equal extrados fixed flange force frame friction gear girder horizontal inch joints latter leading wheels length lever load longitudinal lower machine manganese material means mercury metal metalloids meter mètre obtained ordinary particles passes pile pinion pipe piston placed plates pressure pulley pump quantity rail Railway ratchet-wheel revolving rollers rotary motion rotation screw semolina shaft sheet shown in Fig side sleepers slide slot soffit SPAN specific gravity spindle spur-gear square steam steel stone strain strength strength of materials stroke stuffing box surface thickness timber tons trailing wheels transverse upper valve velocity vertical weight wheel wrought iron
Pasajes populares
Página 2474 - that in all schools children in Standards V. and VI. should know the principles of the Metric System, and be able to explain the advantages to be gained from uniformity in the method of forming multiples and sub-multiples of the unit.
Página 2457 - These simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Página 2379 - Various methods are used by builders for the bond of cut stone. The system, termed headers and stretchers, in which the vertical joints of the blocks of each course alternate with the vertical joints of the courses above and below it, or as it is termed break joints with them, is the most simple, and offers, in most cases, all requisite solidity.
Página 2485 - The areas of circles are proportional to the squares of their diameters...
Página 2378 - For the coping and top courses of a wall, the same objections do not apply to excess in length : but this excess may, on the contrary, prove favorable ; because the number of top joints being thus diminished, the mass beneath the coping will be better protected, being exposed only at the joints, which cannot be made water-tight, owing to the mortar being crushed by the expansion of the blocks in warm weather, and, when they contract, being •washed out by the rain.
Página 2380 - When a block of cut stone is to be laid, the first point to be attended to, is to examine the dressing, which is done by placing the block on its bed, and seeing that the joints fit close, and the face is in its proper plane. If it be found that the fit is not accu•ate, the inaccuracies are marked, and the requisite changes made.
Página 2465 - ... easily driven off. Still there is always an indication of the presence of chlorine in those metals which have been smelted from ores containing it. Chlorine removes all other matter from metals, when the latter are in a state of fusion ; carbon, sulphur, phosphorus, and other volatile matter is driven off by it, and, if the heat is continued, the chlorine itself escapes at last with a portion of the metal, This is the case when only a minute amount of it is present.
Página 2410 - In a cast-iron arched bridge, or in the cast-iron girders of an over-bridge, the breaking weight of the girders should be not less than three times the permanent load due to the weight of the super-structure, added to six times the greatest moving load that can be brought upon it.
Página 2380 - ... differs from coursed rubble in not being built in courses ; but in other respects the same rules are to be observed. The resistance of common rubble to crushing is not much greater than that of the mortar which it contains; it ia therefore not to be used where strength is required, unless built with strong hydraulic mortar.
Página 2631 - ... not from so great a height as to generate a force which would expend itself in crushing the fibres of the head of the pile. In such a case, it will be found that the pile will safely bear, without danger of further subsidence, " as many times the weight of the ram, as the distance which the pile is sunk the last blow, is contained in the distance which the ram falls in making that blow, divided by eight.