A Practical Treatise On the Manufacture And Distribution of Coal Gas
A Practical Treatise On the Manufacture And Distribution of Coal Gas
William Richards
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" fast. " On the other hand, if we suppose the water to be at the point a, 2^ inches from the centre of the axle, then only 25 cubic inches would have to be deducted from the total capacity of the wheel, under which conditions the meter would only register 100, whereas 111 cubic inches of gas would have passed there- through, or in other words it would be 11 per cent, "slow. " On further abstracting the water below the centre ring, which corresponds with the orifice in the hollow cover, the met...er is rendered inoperative, the gas passing freely without being measured. When describing the results of different water-levels in the meter, no attempt has been made at mathematical accuracy ; the angular position of the partitions of the wheel, and the quantity of gas con- tained in the inlet-hoods or passages, would render the calculation too complicated for our object ; but these are mentioned for the purpose of calling attention to the necessity of maintaining the water-level at the proper height, for only by this means can correct measurement be assured.
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