. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 160 BIOLOGY AND TECHNIQUE T an inch above its end. The flame decreases and the temperature again sinks. Since gas pressure in laboratories is apt to vary, it is convenient to interpose between the gas supply and thermo-regulator some one of the various forms of gas-pressure regulators. The use of these is not ab- solutely necessary but aids considerably in the maintenance of a con- stant temperature. The one most commonly employed is the so-called Moitessier apparatus. This consists of
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 160 BIOLOGY AND TECHNIQUE T an inch above its end. The flame decreases and the temperature again sinks. Since gas pressure in laboratories is apt to vary, it is convenient to interpose between the gas supply and thermo-regulator some one of the various forms of gas-pressure regulators. The use of these is not ab- solutely necessary but aids considerably in the maintenance of a con- stant temperature. The one most commonly employed is the so-called Moitessier apparatus. This consists of a cylindrical metal chamber within which there is fitted an inverted metal bell. Glycerin is poured into the cylinder to the depth of about two inches. An inlet pipe con-. FiG. 44.—Moitessier Gas-Pbessdre Regulator. ducts gas into the open space between the top of the glycerin and the bell. From the top of the bell is suspended a conical piece of metal which hangs free in the outlet pipe. As the gas pressure under the bell increases, this is raised and the opening of the outlet pipe is gradually diminished by the cone. Thus the relation between the pressure in the inlet pipe and the actual quantity of gas passing through is equalized. A cup con- nected to the top of the bell through the roof of the cylinder by a bar can be filled with birdshot and the pressure against the gas can thus be modified to conform with existing Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hiss, Philip Hanson, 1868-1913; Zinsser, Hans, 1878-1940. joint author. New York and London, D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkandlondonda
