Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905)
Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 138
. The usual form of draftgauge is a glass tube bent in the shape of the letter U.(See Fig. 12.) One leg is connected to the flue by 3 EVAPORATION TESTS 125 … small rubber hose, while the other is open to theatmosphere. The tube is partly filled with water,which will, when there is no draft, stand at the sameheight in both legs. When connected to the chimneyor flue the suction will cause thewater in the leg to which thehose is attached to rise, whilethe…
