London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 254
General Notices. 2il jr]_ … last figures are drawn todouble the scale oi fig. 117.The advantage of such cocksis, that the turning of thehandle, to draw hot water,acts upon the cold-waterpassages by means of adouble plug and barrel in thecock, so that an equal quan-tity of cold water is admittedin the boiler to that which…
Architecture
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