Articoli correlati a Better roads and streets Volume 5, nos. 1-9
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. 1915 Excerpt: ...one centimeter (0.394 inch) in length, after which it shall be shaken up with just sufficient water to pour easily. The crucible shall be filled with the suspended asbestos and allowed to settle for a few moments. A light suction shall then be applied to draw off all the water and leave a firm mat of asbestos in the crucible.-More of the suspended material shall be added, and the operation shall be repeated until the felt shall be so dense that it scarcely transmits light when held so that the bottom of the crucible is between the eye and the source of light. The felt shall then be washed several times with water, and drawn firmly against the bottom of the crucible by an increased suction. The crucible shall be removed to a drying oven for a few minutes, after which it shall be ignited at red heat over a Munsen burner, cooled in a desiccator and weighed. Two grammes of bituminous material, or ten grammes of an asphalt topping or rock asphalt shall then be placed in an Krlenmcver flask, which shall have been weighed previously, and the accurate weight of the sample obtained. One hundred cubic centimeters (3.381 ounces) of chemically pure carbon disulphide shall be poured into the flask, in small portions, with continual agitation, until all lumps disappear and nothing adheres to the bottom. The flask shall then be corked and set aside for fifteen minutes to allow settlement of the insolublematerial. The weighed (iooch crucible containing the felt shall be set up over the dry pressure flask, and the solution of bituminous material in carbon disulphide shall be decanted through the felt without suction by gradually tilting the flask, with care not to stir up any precipitate that may have settled out. At the first sign of any sediment coming out, the decantatio...
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- EditoreRareBooksClub.com
- Data di pubblicazione2012
- ISBN 10 1130846091
- ISBN 13 9781130846096
- RilegaturaCopertina flessibile
- Numero di pagine420
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