Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . - jar or beaker (C) furnished witha metal cover which is provided witha circular hole in its center. Thisstrong glass vessel serves to hold thefreezing mixture by means of whichthe temperature of the fluid under ex-amination is lowered. A large glasstube (B) designed as an air-jacket,and formed after the manner of atest-tube is introduced through thecentral aperture in the metal cover Fig. 84. 1. Beckmanm - Heiden MAINFreezing-poj nt Ap-paratus. (L
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . - jar or beaker (C) furnished witha metal cover which is provided witha circular hole in its center. Thisstrong glass vessel serves to hold thefreezing mixture by means of whichthe temperature of the fluid under ex-amination is lowered. A large glasstube (B) designed as an air-jacket,and formed after the manner of atest-tube is introduced through thecentral aperture in the metal cover Fig. 84. 1. Beckmanm - Heiden MAINFreezing-poj nt Ap-paratus. (Long.)D, a delicate thermom-eter ; C, the containingjar; B, the outside or airmantle tube; A, the tubein which the mixture tobe observed is stirrers are shown,one for the cooling mix-ture in the jar and onefor the experimental mix-ture. 234 PHYSIOLOGICAL CHEMISTRY. and into this air-jacket is lowered a smaller tube (A) con-taining the fluid to be tested. A very delicate thermom-eter (D), graduated in hundredths of a degree is intro-duced into the inner tube and is held in place by means of acork so that the mercury bulb is immersed in the fluid underexamination but does not come in contact with any glass sur-face. A small platinum wire stirrer serves to keep the fluidunder examination well mixed while a larger stirrer is used tomanipulate the freezing mixture. (Rock salt and ice in theproportion I 13 form a very satisfactory freezing mixture.) In making a determination of the freezing-point of a fluidby means of the Beckman
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherphiladelphiablakis
