A descriptive and historical account of hydraulic and other machines for raising water (1850)
Ewbank, Thomas, 1792-1870 · New York, Bangs, Platt, & Co. · leaf 514
creased the vacuum, an increaseddischarge of the vapor was often found to diminish it. This was frequentlythe case when high steam was employed : for example, if the cock throughwhich steam passed into the blowing tube marked C in No. 217 was wideopen, the mercury would sometimes fall two or three… … No. 216. No. 217. No. 218. No 219. We first passed steam through tubes connected like No. 213, both withand without the conical ajutages C D in Nos. 211 and 212. Various pro-portions of the steam passage over the orifices of the vacuum or exhaustingpipes were also employed, as at A, B, C, D, E, No.…
Pumping machinery
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