Annual Report, Volume 3

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Page 53 - A convenient method for cleaning the apparatus is as follows : The flask is inverted over a large vessel, preferably a glass jar, and shaken vertically until the liquid starts to flow freely; it is then held still in a vertical position until empty; the remaining traces of cement can be removed in a similar manner by pouring into the flask a small quantity of clean liquid benzine or kerosene and repeating the operation.
Page 160 - Nelson P. Lewis, Chief Engineer of the Board of Estimate and Apportionment of New York City.
Page 59 - A moist closet consists of a soapstone or slate box, or a metallined wooden box: the metal lining being covered with felt and this felt kept wet. The bottom of the box is so constructed as to hold water, and the sides are provided with cleats for holding glass shelves on which to place the briquettes. Care should be taken to keep the air in the c'.oset uniformly moist.
Page 60 - Care should be observed in centering the briquettes in the testing machine, as cross-strains, produced by improper centering, tend to lower the breaking strength. The load should not be applied too suddenly, as it may produce vibration, the shock from which often breaks the briquette before the ultimate strength is reached. Care must be taken that the clips and the sides of the briquette be clean and free from grains of sand or dirt, which would prevent a good bearing.
Page 52 - Apparatus and Method — The determination of specific gravity is most conveniently made with Le Chatelier's apparatus. This consists of a flask (D), Fig.
Page 60 - Test pieces should be broken as soon as they are removed from the water. Care should be observed in centering the briquettes in the testing machine, as cross-strains, produced by improper centering, tend to lower the breaking strength. The load should not be applied too suddenly, as it may produce vibration, the shock from which often breaks the briquette before the ultimate strength is reached.
Page 36 - Manganese — Not more than 0.50%. Phosphorus — Not more than 0.25%. Sulphur — Not more than 0.08%. For each new batch of spheres used the chemical analysis must be furnished by the maker, or be obtained by the user, before introduction into the charge ; and unless the analysis meets the above specifications, the batch of spheres shall be rejected. THE TEST.
Page 58 - A check upon the uniformity of the mixing and moulding is afforded by weighing the briquettes just prior to immersion, or upon removal from the moist closet. Briquettes which vary in weight more than 3 per cent from the average should not be tested. Storage of the Test Pieces.
Page 50 - A third pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel for five hours. These pats, to satisfactorily pass the requirements, shall remain firm and hard and show no signs of distortion, checking, cracking, or disintegrating.
Page 49 - All tests shall be made in accordance with the methods proposed by the Committee on Uniform Tests of Cement...

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