Iron: An Illustrated Weekly Journal for Iron and Steel Manufacturers, Metallurgists, Mine Proprietors, Engineers, Shipbuilders, Scientists, Capitalists ..., Tập 60

B́a trước
Perry Fairfax Nursey
Knight and Lacey, 1854
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Trang 204 - His mischief shall return upon his own head, and his violent dealing shall come down upon his own pate.
Trang 493 - ... of metals. Metal in a state of rest, although sustaining a heavy pressure, or strain, as in a beam, or girder, and exhibiting only the deflection due to the superposed weight, would continue to bear that pressure, without fracture, so long as its rest was not disturbed, and the same strain was not too frequently repeated; but if either of these cases occurred, a certain disturbance of the particles took place, the metal was deteriorated, and that portion subject to the reiterated strain, was...
Trang 443 - The movement of the upper one was shown by an index that pointed to the right or to the left according to the direction of the motion.
Trang 243 - ... at once on the same body. The essential parts are merely a bar capable of rotating freely about one end of an axis, (and loaded at its extremities to keep up the rotation,) while the axis itself- can turn about a point in its length near the end carrying the bar, upon a horizontal axis, capable of moving freely round a vertical pillar. At the lower end of the first axis is a weight which more than counterpoises the upper part. If then there be no rotation in the bar about the first axis, the...
Trang 345 - ... plate behind the bridge, satisfied all that nature required in producing perfect combustion. The tubular form of boiler, however, rendered a different arrangement absolutely necessary. This was occasioned by the run or distance between the bridge and the tubes being so very short; and, consequently, the passing along that distance being so limited in time, that the mixing and combustion could not be adequately effected. This, after numerous trials and expedients, led to placing the orifices of...
Trang 176 - ... mass against the cold one underneath it, the taps being in many cases sufficiently quick to produce a high musical note. The alternate expansion and contraction of the cold mass at the points where the hot rocker descends upon it, he regarded as the sustaining power of the vibrations. The superiority of lead he ascribed to its great expansibility, combined with its feeble power of conduction, which latter prevented the heat from being quickly diffused through the mass. Professor...
Trang 296 - Some years since Mr. Gillett was led by observation to appreciate the importance of controlling, not merely the quantity of light, which may be effected by a diaphragm placed anywhere between the source of light and the object, but the angle of aperture of the illuminating pencil, which can be effected only by a diaphragm placed immediately behind the achromatic illuminating combination.
Trang 327 - It is in vain that we look for genius to reiterate its miracles in the old arts; it is its instinct to find beauty and holiness in new and necessary facts, in the field and road-side, in the shop and mill.
Trang 246 - It always affords a sort of intellectual surprise to perceive for the first time the application of some simple and familiar mechanical principle to the grand phenomena of astronomy ; to see that it is but one and the same set of laws which governs the motions of matter on the earth and in the most distant regions of the heavens ; to find the revolution of the apsides in a pendulum vibrating in ellipses, or the conservation of areas in a ball whirled round by a string suddenly shortened ; or (as...
Trang 296 - ... and which, consequently, are the extreme available rays. A very perfect instrument for measuring the angle of aperture, designed by Mr. Gillett, was then explained. This consists of two microscopes, the optical axes of which may be adjusted to coincidence. One of these is attached horizontally to the traversing arm of a horizontal graduated circle, and is adjusted so that the point of a needle, made to coincide with the axis of motion of the moveable arm, may be in focus and in the centre of...

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