The School of Mines Quarterly, Band 36Columbia University, 1915 |
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Häufige Begriffe und Wortgruppen
alloys andesite anhydrite anhydrite occurs annealing anorgan apatite apparatus asphalt batholith biotite brass Brilliant bronze Bunsen burner calcite carbon cement Chalcedony Chatoyant Chem chemical coal cold-work color Colorless combustion zone copper corrosion cost crystalline crystals Cu-Zn deposit diagram diameter Effect electric engineering Etched eutectic feed hole feldspar flame furnace Fuses Geol glass grains granodiorite green Greenish gypsum hearth heat highways Infus Insol Inst Internat lustre material Metallog Metallography Metallurgie Metals methods microscopic Miller River minerals mixture Mound House Opaque operation orthoclase pavement plagioclase Pleochroism present pressure Professor Munroe properties pyrite quartz rate of combustion Refraction Revue rock School of Mines sericite shaft shows Snoqualmie solid solutions specific gravity steel stone structure sulphides supply surface combustion temperature ternary tests thick tion tourmaline varying vein yellow York Zeits zinc
Beliebte Passagen
Seite 151 - ... (75) pounds per square inch in the amount and between the limits of temperature specified. It shall be supplied with an accurate stationary thermometer in the tank containing the...
Seite 148 - ... supervises the design and construction while the responsibility for maintenance is placed upon the county or town. Fourth. The comparatively small number of well trained highway engineers who have devoted the requisite time and energy to the many new problems which have arisen during the last decade. Fifth. The comparatively infinitesimal amount of investigation which has been considered necessary as preliminary to the design of a road or street or a system of highways. This condition is due...
Seite 151 - In the tank containing the bituminous material and with an accurate pressure gauge so located as to be easily observed by the engineer while walking beside the distributor. It shall be so operated that, at the termination of each run, the bituminous material will be at once shut off.
Seite 151 - The distributor shall be provided with wheels having tires each of which shall not be less than eighteen (18) inches in width, the allowed maximum pressure per square inch of tire being dependent upon the following relationship between the aforesaid pressure and the diameter of the wheel : For a...
Seite 152 - The reasons for condemning these specifications (NY Highway Comm. 1913 specifications for cold oil and hot oil) are based upon knowledge of materials having similar physical and chemical properties and the use of such materials in the manner specified. These reasons are as follows: (1) Oils which meet these specifications require considerable time in which to set up, when used in the manner specified; (2) all petroleum products, while in a fluid state, act to a certain extent as lubricants, when...
Seite 152 - ... the bituminous mats or carpets formed invariably become wavy and full of humps and ruts under heavy traffic; (5) due to the character of the resulting surface further maintenance is rendered difficult and costly; (6) prior to retreatment of roads thus repaired, it is often necessary to remove considerable portions of the bituminous mats with picks and shovels or with scarifiers. The above conclusions are in accordance with the results of our investigations of many miles of highways treated as...
Seite 316 - Legislatures of 1841 and 1842, under which the assessors are required to "assess rate and value every subject of taxation according to the actual value thereof, and at such rates and prices as the same would bring at a bona fide sale after due notice.
Seite 151 - It shall be so operated that, at the termination of each run, the asphalt cement or refined tar will be at once shut off. It shall be so designed that the normal width of application shall be not less than six (6) feet and so that it will be possible on either side of the machine to apply widths of not more than two (2) feet. The distributor shall be provided with...
Seite 175 - ... p. 136) A mineral mass, tabular in form, as a whole, although frequently irregular in detail, occupying or accompanying a fracture or set of fractures in the inclosing rock ; this mineral mass has been formed later than the country rock, either through the filling of open spaces along the latter or through chemical alteration of the adjoining rock.
Seite 6 - The strength of Portland cement after setting is due entirely to the crystallization of calcium hydrate under certain favorable conditions and not at all to the hydration of the silicates or the aluminates, since in this act of hydration nothing can take place which would tend to bind these silicates and aluminates together.