San Francisco : Architect and Engineer, Inc · leaf 380
ofnumbers of scattered trees, the preparing atsome points of a solid sub-grade, more or lessculvert and bridge preparation, and some-times long stretches where sheer walls ofgranite, sandstone or limestone obstructs theline of route; and where drilling, blasting, crow-baring and pickaxing are the… … WHERE MODERN ENGINEERING BUILT A MOTOR HIGH-WAY IN MEXICAN MOUNTAIN GORGES. FIRST SCOUTINGTRIP OVER THE BARRANCAS COUNTRY. THREE TENTHS OFA MILE AT THIS POINT TOOK A DAY FOR THE AUTOMO-BILES TO TRAVEL. ALMOST A FOOT AT A TIME. ments In highway machinery have kept stepwith these advances, and the…
Architecture · Building
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