A Practical Treatise on the Manufacture of Portland Cement

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E. & F.N. Spon, 1868 - Kilns - 188 pages

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Page i - PRACTICAL TREATISE ON THE MANUFACTURE OF , PORTLAND CEMENT: By HENRY REID, CE To which is added a Translation of M. A. Lipowitz's Work, describing a new method adopted in Germany of Manufacturing that Cement. By WF REID. Illustrated by plates and wood engravings. 8vo...
Page 78 - Abyssinia. (AJB) upon it, one at each of the four corners, and one in the middle. The liturgy is celebrated upon the Ark four times in the year, within the palace of the king ; and a canopy is spread over it when it is taken out from [its own] church to the church which is in the palace of the king : namely on the feast of the great Nativity, on the feast of the glorious...
Page 68 - ... to its full height at once, by pitching large blocks of beton into the sea from a temporary waggon road. Many of the blocks were broken, and the work often breached, by the adoption of this plan ; but such mishaps were difficult to avoid, as there was no possibility of conveying the blocks by water. The blocks used had a cube of 33 tons each, and were composed of Portland cement, stone and sand, in the proportions of 1 part of cement to 2 parts of sand, and 3 parts of broken stones. After being...
Page 42 - ... the common axis than those pertaining to the upper portions with a view to lessen the strain, and the effects of sudden shocks upon the machinery, by securing a more gradual reduction of the stone to the required size. These lower portions being subject to very rapid wearing, are made of...
Page 92 - These arms support the planking which deter mines the thickness of the wall, and are attached — one fixed, and the .other movable — to a horizontal brace. When in use, the entire apparatus is kept in position by securing this brace to some fixed point of support. In carrying up the walls of a building, these points of support are provided on the inside, being vertical posts secured to the ground, in the first instance by braces, and afterward to the flooring joists of the upper stories.
Page 57 - ... compact in the measure, he thought that the stipulation as to weight — though probably the manufacturers did not wish to have any more tests imposed — should be combined with that of sifting, so as to ensure the fine grinding of the cement, as if this were not done he thought the requirement as to weight was liable to act as a premium for coarse grinding. In reference to this, he would state that he had sifted through a sieve with 900 holes to the square inch, a certain portion of the cement...
Page 41 - ... the stone as it passes down between them. The elements of the lower portions of both cones make a smaller angle with the common axis than those pertaining to the upper portions, with a view to lessen the strain, and the effects of sudden shocks upon the machinery, by securing a more gradu- Fig- 32.
Page 57 - ... granulated material into a particular measure. In corroboration of this he would state the results of what he had tried lately. A quantity of cement was poured into a bushel measure by a man accustomed to the work, and struck off level; it then weighed 107 Ibs. exclusive of the weight of the measure. Then another portion of the same cement was poured slowly out of the sack down an inclined board into the bushel measure, and it then weighed only 97 Ibs.; he then had it shaken down in the measure,...
Page 42 - ... or 16 inches. The diameter of the shell, measured within the largest flanges, is 14 to 15 inches at the top and a trifle greater than that of the core at the bottom, while its height is 16} to 18 inches. One cracker of this size, working with a velocity of 80 to 85 revolutions per minute, is sufficient for a mill grinding 250 to 300 barrels per day. It is customary to provide one cracker for every two run of millstones.
Page 49 - The absolute penetration of the needle is obtained by •"taking the difference between the index readings before and "after impact. The falling body is a hollow metal cylinder, ' ; weighing one pound, of which the exterior diameter is about "equal to the length. " This cylinder, in its descent, passes freely over the spindle, " and strikes upon the shoulder attached just above the screw.

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