This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ..."K." Preservative. The preservative shall be a product of coal-gas, water-gas, or coke-oven tar, which shall be free from all adulterations and contain no raw or unaltered tars, petroleum compounds, or tar products obtained from processes other than those stated. The specific gravity shall be not less than 1.10 nor ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ..."K." Preservative. The preservative shall be a product of coal-gas, water-gas, or coke-oven tar, which shall be free from all adulterations and contain no raw or unaltered tars, petroleum compounds, or tar products obtained from processes other than those stated. The specific gravity shall be not less than 1.10 nor more than 1.14 at a temperature of 38 C. Not more than 3 % % shall be insoluble by continuous hot extraction with benzol and chloroform. On distillation, which shall be made exactly as described in Bulletin No. 65 of the American Railway Engineering Association, the distillate, based on waterfree oil, shall not exceed % % at 150 C, and shall be not less than 20% nor more than 40% at 315 C. The oil shall contain not more than 3% of water. The manufacturer of the blocks shall permit full and complete sampling at all times and places, and shall, if required, furnish satisfactory proof of the origin of the preservative. Samples of the preservative, taken from the treating tank during treatment, shall at no time show an accumulation of more than 2% of sawdust, dirt or other foreign matter. Due allowance shall be made for such accumulation of foreign matter by injecting an additional quantity of oil into the blocks. Exhibit "L." WOOD BLOCK SPECIFICATIONS, CITY OF BRIDGEPORT, CONN. The blocks shall be made from Southern yellow pine, and shall be free from unsoundness, shakes, or cracks or other defects which might impair the durability of the pavement. The annual rings shall average eight to the inch, but in no case shall be less than four to the inch measured radially. The blocks shall be carefully sawed from 5 to 8 ins. long, 36 ins. in depth, and 3 ins. in width. All blocks in one street shall be of uniform width. The variation of...
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