San Francisco : Architect and Engineer, Inc · leaf 191
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… … 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 ARCHITF.CT AND ENGINKF.H ^ 46 ► nl-CKMBKR. NINEIKEN…
Architecture · Building
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