American rural highways

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McGraw-Hill book company, inc., 1920 - Roads - 139 pages
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Page 37 - ... or even less, may be used. C should be. increased for steep side slopes, especially if the upper part of the valley has a much greater fall than the channel at the culvert.
Page 37 - J ; and if the stream is longer in proportion to the area, decrease C. In districts not affected by accumulated snow and where the length of the valley is several times the width, 1 or \, or even less, may be used.
Page 82 - Two mixtures of gravel, sand, and clay shall be used, hereinafter designated in these specifications as No. 1 product and No. 2 product. No. 1 product shall consist of a mixture of gravel, sand, and clay, with the proportions of the various sizes as follows: All to pass a...
Page 17 - The Bureau of Public Roads of the United States Department of Agriculture.
Page 48 - ... directly as the square of the velocity, and inversely as the radius of curvature, or directly as the greatness of the curvature.
Page 116 - Coal tar is obtained as a by-product in the manufacture of charcoal, coke and gas.
Page ii - Coal Age v Electric Railway Journal Electrical World v Engineering News-Record American Machinist v...
Page 82 - ... screen; at least 25 and not more than 75 per cent of the total coarse aggregate to be retained on a 1-inch screen; at least 65 and not more than 85 per cent of the total fine aggregate to be retained on a 200-mesh sieve.
Page 125 - Bituminous macadam roads. — a. Maintenance. — This type of road is patched by loosening the stone in the area affected, adding new stone as needed, and then pouring on the necessary amount of bituminous material to coat the stones. Allowance must be made for the compression of the material by tamping, so that a depression does not result. The stones are carefully tamped in place and covered with chips which are also tamped. Figure 29 shows a typical cross section of a bituminous macadam road...
Page 117 - ... been made to use coke breeze in the manufacture of briquets. The quantity of breeze produced each year in the manufacture of gas coke amounts to between 2,000,000 and 3,000,000 tons. The Los Angeles Gas & Electric Corporation, of Los Angeles, Cal., operates a briquetting plant for utilizing the carbon obtained as a by-product in the manufacture of illuminating gas from crude petroleum. The briquets, or " boulets," make excellent domestic fuel.

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