The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 131
opening outwards to allow of the escape, at certain periods of theoperation, of any steam or air contained in the chamber, p is aglass gauge-ball, in communication with the chamber B, by meansof a small pipe, wliicb depends from the top of that chamber toabout one-fifth of its depth. This ball p is…
Architecture · Civil engineering · Science
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