. A treatise on pharmacy for students and pharmacists. Reicherts thermostat. The Bunsen-Kenip gas regulator or thermostat. 78 GENERAL PHARMACY. of which the supply of gas admitted to the burner is automaticallycontrolled by expansion and contraction of mercury contained inglass cups or tubes kept in contact with the air or liquid the tem-perature of which it is desired to maintain at, or near, certain gas supplied to the burner is made to pass through the thermostat,and the required temperature having been reached, the gauge is setby means of a screw, after which the supply of gas i
. A treatise on pharmacy for students and pharmacists. Reicherts thermostat. The Bunsen-Kenip gas regulator or thermostat. 78 GENERAL PHARMACY. of which the supply of gas admitted to the burner is automaticallycontrolled by expansion and contraction of mercury contained inglass cups or tubes kept in contact with the air or liquid the tem-perature of which it is desired to maintain at, or near, certain gas supplied to the burner is made to pass through the thermostat,and the required temperature having been reached, the gauge is setby means of a screw, after which the supply of gas is controlled bythe expansion of the mercury caused by an increase of heat. and 60 show two thermostats frequently employed. The steam boiler, Fig. 61, designed by Prof. E. L. Patch, is a Fig. Prof. Patchs steam boiler. most convenient source of heat for the requirements of a small labo-ratory. The boiler, 22 inches high and 10 inches in diameter, ismade of steel, contains 20 flues, and is covered with a thick layer ofasbestos composition, to prevent loss of heat by radiation; it hasa capacity of 7 gallons and possesses one great advantage—thatit can be heated by means of either a gas or a coal-oil provided with a water-gauge, safety-valve and manometer,the boiler is as complete as any of larger size, and steam can becarried from it to any point desired; it is usually filled from aboveat the safety-valve, but, wherever water service is available, aninjector may be attached, so as to allow of filling while steam pres- HEAT. 79 sure is on. The coil of pipe in the conical ly shaped metal case onthe side, may be used for hot filtration, evaporation or drying pur-poses. It is well known that steam, when confined, is capable of absorb-ing large quantities of heat, a
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Keywords: ., bookcentury1800, bookdecade189, booksubjectpharmacy, bookyear1895
