Laboratory Instructions for Tests of Metal, Timber, Brick, Contrete

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1912 - Building materials - 48 pages
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Page 63 - The beaker in which the cube is suspended is of the tall-form Jena type without lip. The metal cover has two openings. A cork, through which passes the upper arm of the wire, is inserted in one hole and the thermometer in the other. The bulb of the thermometer should be just level with the cube and at an equal distance from the side of the beaker.
Page 60 - ... the mineral matter or ash, which can be weighed on cooling. The difference between the total weight of material insoluble in carbon disulphide and the weight of substance taken equals the total bitumen, and the percentage weights are calculated and reported as total bitumen, and organic and inorganic matter insoluble, on the basis of the weight of material taken for analysis.
Page 68 - Care must be taken that oil does not flow over the flange. Remove all the air bubbles with a piece of dry, soft paper. Place the glass cover C on the oil cup and adjust the thermometer so that its bulb shall be entirely covered by the oil. Fill the lamp with alcohol only, for heating the water bath. Trim the wick carefully, and so adjust the flame that the degree of heating will not exceed, two degrees per minute. When the temperature of the oil has reached...
Page 63 - ... observation, which may be made constant by always sighting from the front edge of the opening to any given point on the stem of the thermometer below the cover. After the test specimen has been placed in the apparatus, the liquid in the outer vessel is heated in such a manner that the thermometer registers an increase of 5 C. per minute. The temperature at which the bitumen touches a piece of paper placed in the bottom of the beaker is taken as the melting point. Determinations made in the...
Page 30 - Choose scales such that the slope of the diagram near the origin shall be about sixty degrees. Each division of the paper must represent a decimal increment. Plot each point plainly. Draw a straight line averaging those points which precede the more rapid increase in deflection. Tangent to this line draw a smooth curve averaging the subsequent points. Mark on the...
Page 44 - Rotate the rattler through 1800 revolutions at a speed of not less than 29% nor more than 30y2 revolutions per minute.

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