Spons' Dictionary of Engineering, Civil, Mechanical, Military, and Naval; with Technical Terms in French, German, Italian, and Spanish, Volume 8

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E. & F.N. Spon, 1872
 

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Página 1883 - ... receive a velocity equal to that which it would have acquired by falling freely from the same height. Consequently, since the fluid particles which pass from the orifices M and N are raised to the respective heights MG and NH on passing out, they must have been impelled with velocities due to those heights, which are the heights of the surface of the reservoir above the orifices. In like manner, if on a vertical face...
Página 1758 - IB equal to the weight or pressure which generates that motion, and this is equal to the weight or pressure of a column of the fluid, the base of which is the area of the plane, and its altitude that which is due to the velocity.
Página 1541 - Jj.th part of tin ; sufficient metal being used to form a strong plate for the surface of the ramming-block, and the rest of the space at the back filled with plaster as usual. In practice it is more convenient generally to reverse the mode of running this metal for the face of the mould, by first ramming the box, when prepared for the plaster, full of sand, then lifting it off, and paring off the surface of the sand wherever the metal is wanted to such depth (about f.
Página 1919 - The Elementary Principles of Carpentry. By THOMAS TREDGOLD. Revised from the original edition, and partly re-written, by JOHN THOMAS HURST. Contained in 517 pages of letterpress, and illustrated with 48 plates and 150 wood engravings.
Página 1647 - ... rubbing one on the upper and the other on the under side of the commutator are also very distinctly seen. The field-magnet consists of several' thin steel plates of horse-shoe form, with a pair of soft-iron pole-pieces, so shaped as nearly to surround
Página 1541 - ... it. In this plan the mould for the face of every casting is formed from the original metal pattern, and the pattern itself is firmly and permanently secured in the plaster bed ; so that, however thin and delicate it may be, there is no risk of injury to the pattern, in moulding any number of castings ; — as many as 3000 have been cast without injury from a slender ornamental pattern. In forming the...
Página 1919 - Hurst's Pocket-books, printed on thin paper and bound together in one volume, royal 32mo, russia, gilt edges, 12s. 6d. Engineers' Pocket-book. A Pocket-book of Useful Formulae and Memoranda for Civil and Mechanical Engineers, by GUILFORD L. MOLESWORTH, Member of the Institution of Civil Engineers, Consulting Engineer to the Government of India for State Railways, seventeenth...
Página 1540 - ... by corresponding projections or ribs upon the parting face of the one, and hollows in the other (which are then stopped up with plaster), and these are properly repeated in the final sand moulds...
Página 1541 - Paris is most generally employed, as the most convenient and economical material, and this is found to be sufficiently durable for general work ; the blows of the rammer are deadened by the sand in the box, and do not fall directly upon the plaster block, so that there is no risk of injury with ordinary care in ramming. As many as 4000 castings have been moulded from one pair of plaster blocks ; but when a greater number of castings are required to be moulded from one pattern, or when the size or...
Página 1542 - ... forms a perfect counterpart of the intended casting, (half being represented upon each,) surrounded by parting faces which exactly fit one another, because the one has been moulded from the other. .Where the pattern is long, and a metal face is employed, a narrow division is made, subdividing the metal face into two or more lengths, to allow for the shrinking of the metal forming the face, the effect of which is then found to be imperceptible. The...

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