Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 495
, 5 to 15 per cent shall be of an impalpa-ble powder, the whole of it to pass a No. 26 screen; of the sand, none to passa No. 80 screen; and the whole of it, a No. 10 screen. Pavements^ Salt Lake City^ Utah.—The streets are 92 feet from curb tocurb. The pavement is practically in two portions—an… … /lsp/70/t 3^o/7e /isp/70rr Cirone , Co/7crefe 6 0 3^^^ Fig. 1125. coarse sand laid on a foundation compacted by a 10-ton steam roller ; the sand stratum is 6 thick. Theblocks are of very hard sandstone, and vary from4J X 7 ; they form a pavement 7 thick, withfilled with fine-screened gravel and…
Mechanical drawing
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