Architect and engineer . adedwith 100 to 350 pounds of 60, dynamite,were driven into the holes. These bombshad points formed by cutting the sides ofthe pipe into four gores, bending the goresand welding them together into a pointabout six inches long. The cartridges ofdynamite were packed in and the voids be-tween them filled with dry cement, aboutone sack being required per bomb. On topof this 18 inches of concrete of about 1 :3:3proportions was placed for tamping thecharge. The size of the charge was deter-mined by the blasting effect desired, thesmall bombs being used near the slopes andbot
Architect and engineer . adedwith 100 to 350 pounds of 60, dynamite,were driven into the holes. These bombshad points formed by cutting the sides ofthe pipe into four gores, bending the goresand welding them together into a pointabout six inches long. The cartridges ofdynamite were packed in and the voids be-tween them filled with dry cement, aboutone sack being required per bomb. On topof this 18 inches of concrete of about 1 :3:3proportions was placed for tamping thecharge. The size of the charge was deter-mined by the blasting effect desired, thesmall bombs being used near the slopes andbottom of the excavations and the largebombs in the body of the excavation. Thepipes were made 22 long for a blast hole20 deep. The pipes were driven into theholes with a cable tool follower 9 inchesin diameter and weighing 2^ tons. Thishad a square shoulder for driving on theend of the pipe and a sharp pilot point forentering the pipe. Within each pipe the THE ARCHITECT AND ENGINEER ^ 45 ? DECEMBER, NINETEEN THIRTY-THREE. Photo by McCallum Air Srrvke and S. C. Lons Produclirm AERIAL VIEW AT 1000 FEET ELEVATION, SHOWING ACCESSTRESTLE TO SOUTH PIER SITE ON SAN FRANCISCO SIDE,GOLDEN GATE BRIDGE. About 800 feet of this trestle was swept awayby heavy seas Dec. 1 3. THE AND ^ 46 ? nl-CKMBKR. NINEIKEN THIRTY-THREE blasting wire connecting with the chargewas coiled and after driving the pipe, adiver brought the end of this wire to thedeck of the barge where it was connectedto a battery. Blasting Tube To insure the dropping of the successivepilot bombs in a true vertical position in thedeep water at the site, also to guide thelarge bomb into the hole, and serve as aguide for the cable driving tool, a blastingtube of 14 inch O. D. casing j j thick wasmade. This tube was 120 long and toprevent damage to the tube by the pilotbomb explosions, the foot of the tube wasraised about four feet above the groundby a pair of steel legs made of 12xl0—H— beams and spanning abou
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Keywords: ., bookcentury1900, bookdecade1900, booksub, booksubjectarchitecture
