Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 499
ducing concrete blocks there are three differentmethods, tamping, pressing, and pouring, each adapted to a par-ticular mixture for a special kind of work. Two-piece walls, de-vised in 1902, deserve a word of description. The pressed blocksof which they are built show the new freedom conferred by… … Section A B Wall of two-piece concrete blocks.American Hydraulic Stone Co., Denver. block extends through the wall. By leaving the exterior verticaljoints open to afford a free circulation of air, no part of a blockon one side of the wall touches any block from the opposite side;this prevents the…
Inventions · Inventors
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