Bulletin, Issue 10

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Page 80 - ... inside diameter. The paved spaces on each side of the 18 middle feet are to be coated with broken stones or well cleansed, strong gravel, up to the footpath or other boundary of the road so as to make the whole convexity of the road 6 inches from the center to the sides of it.
Page 42 - For convenience all minerals are referred to a scale of hardness of ten units, composed of common or well known minerals, which are as follows: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; (8) topaz; (9) sapphire; and (10) diamond.
Page 80 - After the grouting is done and a sufficient time for hardening has elapsed, so that the coating of sand will not absorb any moisture from the cement mixture, one-half inch of sand shall be spread over the whole surface, and in case the work is subjected to a hot summer's sun, an occasional sprinkling sufficient to dampen the sand .should be followed for two or three days.
Page 79 - Two such boxes shall be provided in case the street is twenty feet or less in width; exceeding twenty feet in width, three boxes should be used. The work of filling should thus be carried forward in line until an advance of...
Page 80 - Portland cement grouting, consisting of one part of portland cement and one part of clean, sharp sand, should...
Page 79 - From the time the water is applied until the last drop is removed and floated into the joints of the pavement, the mixture must be kept in constant motion. The mixture must be...
Page 71 - ... per cent of bitumen, and not over ten per cent of carbonate of lime. The bituminous limestone and bituminous sandstone should be finely ground and thoroughly mixed without the addition of any extraneous materials. The mixture should be heated in a steam heating machine at a temperature of not less than 250 degrees Fahrenheit. As in the case of sheet asphalt, the mixture should be spread at a temperature of not less than 250 degrees Fahrenheit and to such a depth that after it has received its...
Page 288 - The machine shall consist of one or more hollow iron cylinders; closed at one end and furnished with a tightly fitting iron cover at the other; the cylinders to be 20 cm. in diameter and 34 cm. in depth, inside. These cylinders...
Page 46 - The hardness is 5.5 to 6.5. Magnetite is one of the commonest constituents of the igneous and metamorphic rocks, and is most often present in small grains or crystals scarcely visible to the naked eye. When present in larger individuals it is easily recognized by its brilliant...

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