Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 347
the ordinal XT-tube has been replaced by a tubeslightly inclined to the horizontal, as shown in Fig. 108,By this arrangement anjr vertical motion in the left handupright tube causes a very much greater travel of theliquid in the inclined tube, thus permitting extremelysmall variation in the draft… … Fig. 108ellisons draft gauge outline it) until its meniscus rests at the zero point on the right.The left hand leg is then connected to the source of draftby means of a piece of rubber tubing. Under these cir-cumstances, a rise of level of one inch in the left handvertical tube causes the meniscus…
