A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine (1876)
Ewbank, Thomas, 1792-1870 · New York : Scribner, Armstrong · leaf 504
he vacuum, an increase Jdischarge of the vapor was often found to diminish it. This was frequentlythe case wlien liigh steam was employed : for example, if the cock tiiroughwliicli steam passed into the blowing lube marked C in No. 217 was wideopen, the mercury would sometimes fall two or three… … No. 216. No. 217. No 219. VVe first passed steam through tubes connected like No. 213, both withttnd 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. 216,…
Pumping machinery
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