Synopsis
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. 1916 Excerpt: ...this shall be by means of templets of design furnished to the contractor in the diameter of the holes for the base plate, 0.5 mm plus or minus; in their position, 0.5 mm in the direction of the height and 2 mm in the direction of the length of the rails. The tolerances described shall, as a whole, be such that in any case the weight of the rails shall remain within the limits defined below. Normal Weight Of The Rail And Tolerance.--At the beginning of the manufacture of the rails the normal weight per meter shall be determined by choosing and weighing 10 rails of great length from the first lot submitted for acceptance, and of dimensions as near as possible to those indicated by the designs. There shall be accorded a tolerance of ±2.5 per cent in the normal weight, but the total weight of each partial delivery shall not be less than the normal weight by more than 1 per cent. Outside of the limits thus fixed the deliveries may be refused. Within the limit of that tolerance, for each partial delivery, the material shall be paid for according to its real weight up to the normal weight increased by 1 per cent; above that the excess weight shall not be paid to the contractor. 4. Quality of the Material.--The steel for the manufacture of these rails shall contain more than 0.3 per cent of carbon and less than 0.11 per cent of phosphorus. To verify these analyses, the official of tests shall take from one or several of the heats, which make each of the series of 200 rails, and at the moment which he shall indicate, test samples, of a form indicated by him and of a weight not greater than 50 grams. Two samples shall be chosen and stamped by the inspecting agent for each of the heats for which he shall have prescribed that analysis be made. One of these samples...
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