Modern practice in mining by Redmayne Richard Augustine Studdert 1865-

Author:Redmayne, Richard Augustine Studdert, 1865- [from old catalog]
Language: eng
Format: epub
Tags: Mining engineering, Coal mines and mining
Publisher: London, New York [etc.] Longmans, Green, and co.
Published: 1908-03-25T05:00:00+00:00

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Fig. 25.—Apparatus for Determining Small Variations in the Difference of Pressure when Great Accuracy is required.

the apparent water-gauge, from which the true height of water-gauge can be calculated thus :—

Supposing the angle made by joining the point reached

by the level of the

liquid in the upper M ^1 ^

branch of the tube

with that reached

by the liquid, in

the lower branch

of the tube is

30*^, viz. the angle Fig. 26.—Diagrammatic Representation of the Method ABO Tsee Fio* 26^ ^^ Calculating the True Height of Water-gauge

and the length AB is the apparent water-gauge. The true reading will be the length AC, and AC = ABxTan CBA. The length AB being determined from the scale reading, this being 2 inches in the'above figure.

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