Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 496
3 cushion of sand. Acrown of 4 is allowed in a roadway 50 feet wide, and 3 in a roadway 40 feetwide. ^lodulus of rupture in compression: First-quality brick, 1,700 pounds persquare inch; absorption, 1*6 per cent; abrasion under test to be equal to granite. ENGINEERING DRAWING. 4Y9 Modulus of… … 6 CEDAR BLOCKS 2x 12 PLANKlx 12STRINGERSSAND curbstone is set to the true grade, and the ground between is graded to thetrue cross-section of the street. After this the surface is rolled by a heavysteam roller; next, 3 of coarse sand is spread over the entire surface. String-ers 1 X 12 are then…
Mechanical drawing
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