Stone; an Illustrated Magazine, Band 371916 |
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Seite 441 - GLORY be to GOD on high, and on earth peace, good will towards men. "We praise thee, we bless thee, we worship thee, we glorify thee, we give thanks to thee for thy great glory, 0 LORD GOD, heavenly King, GOD the Father Almighty.
Seite 392 - The specific gravity of a solid is its weight compared with the weight of an equal volume of distilled water at the temperature of 39.2° F.
Seite 441 - Use of explosives and wedges. — At no point in granite quarrying is more experience and judgment requisite than in the use of explosives. The selection of the place for blasting, the size and shape of the hole, the selection of the powder, and the size of the charge are all matters requiring careful consideration. The thickness of the sheet, the proximity of joints, the vitreousness of the stone, its rift and grain structure, the physical and mathematical laws governing the action of explosives,...
Seite 441 - As is well known, splitting is now done almost entirely by the use of pneumatic plug drills. The holes are 3 to 4 inches deep, three- fourths inch in diameter, and a few inches apart. Every few feet a deeper hole is drilled. Iron wedges are then very gradually driven in between steel side pieces called " feathers." A difference is found in blasting and splitting granite in winter and summer. A low temperature increases its cohesiveness, but, probably in connection with water, increases its fissility...
Seite 393 - The printer, the iron and steel worker, the founder, may do the same, and enjoy the same profound satisfaction. The toiling factory girl, spinner or weaver of textiles, will observe that she has not been forgotten, and those who are devoted to the sea can discover a group which will remind them of the joys of their vocation. A wave terminates the sculpture at either end of the pediment, and is meant to indicate that all this humanity, all its power and energy are comprised between the shores of two...
Seite 360 - BY USING Blasting Machines FIRING loaded bore holes with electrical currents decreases the liability of accidents, increases the efficiency of explosives and reduces the cost of blasting operations. Simplicity of design, compactness and dependability In operation make Du Pont Blasting Machines practical and popular with blasting crews. Safeguard life and property by requiring the use of blasting machines for detonation of explosives.
Seite 443 - As the polish depends almost entirely upon these two operations, care must be taken that they are performed with a regular and steady movement. When the marble has received the first polish, the flaws, cavities, and soft spots are sought out and filled with mastic of a suitable color.
Seite 441 - The next step is a careful exploration of the granite surface, if necessary, by stripping in trenches, with a view to determine the areal extent of the quality of stone tested, the character of the jointing, the presence of headings, dikes, and veins, and the frequency of knots. Stripping. — The thickness of soil or till upon the granite surface and that of the decomposed surface rock should be estimated.
Seite 578 - ... waste material encumbers the ground, impedes lateral development, and interferes with yard operations. The failure of some quarry companies to realize a profit is due to the quarrying of an excessive amount of material that remains unutilized. The problem of waste is twofold. In the first place it has to do with all types of improved equipment and modern methods of excavation which tend to keep the proportion of waste at a minimum; and in the second place it must deal with the various uses to...
Seite 443 - For green and red marbles, this mastic is sometimes made of gum lac, mixed with Spanish sealing wax of the color of the marble. It is applied with pincers, and these parts are polished with the rest. Sometimes crushed fragments of...