. Journal. out 130 As oon as the importance of small variations of emperature had been established it became ssential to work in a thermostat, and as it was esirod to carry out the experiments at not more ban 20° C. whUst of ice was impracticable, water cooled thermostat was constructed. The rrangement, which appears to be novel in some wpects, is shewn in Fig. I. The thermostat consists essentially of an outer essel. A. and of an inner vessel, B, which contains be usual form of gas regidator and stirrer and erforated tray on which the bottles, etc., rest. The outer vessel is itse
. Journal. out 130 As oon as the importance of small variations of emperature had been established it became ssential to work in a thermostat, and as it was esirod to carry out the experiments at not more ban 20° C. whUst of ice was impracticable, water cooled thermostat was constructed. The rrangement, which appears to be novel in some wpects, is shewn in Fig. I. The thermostat consists essentially of an outer essel. A. and of an inner vessel, B, which contains be usual form of gas regidator and stirrer and erforated tray on which the bottles, etc., rest. The outer vessel is itself formed of an inner andan outer wall and is closed at the top. Waterfrom the main is allowed to run into the vessel, A,by the funnel, C, and to escape by the overflow, addition to the overflow, 1), a number of smallholes are punched in the outer casing of A bywhich water escapes and flows over tlie ovitersurface, which is encased in some fabric such asbutter muslin. In hot weather evaporation of the. Fig. I. film of water thus produced assists in keepingdown the temperature of the water in A. Thewhole apparatus stands in a tray, E, providedwith an overflow. Between A and B an air space isprovided in order to avoid sudden fluctuations oftemperature. B may therefore be considered asstanding in a room of approximately constanttemperature. A small piece of tube, F, is sweatedinto the bottom of A tluough which the heatingpipe, G, passes loosely. G is sweated into thebottom of B and rises above the water level. Itcarries the products of combustion of the controlledpinhole burner, H. This apparatus gives verysatisfactory results, and it was found practicableto keep the temperature within 0-1° C. of 20° on three or four days in 1914 and with noexception in ?.915. The temperature can bemaintained within 3 C. of the temperature of thewater in the mains so long as the room temperaturedoes not exceed the thermostat temperature bymore than 2 or 3°. Even a higher room tem
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
