. Manual of bacteriology. Bacteriology. STORING AND INCUBATION OF CULTURES. 83. Fig. 47. — Reichert's gas regulator. between which some fluid (water or glycerin and water) is placed, which, when raised to a certain temperature, ensures a fairly constant distribution of the heat round the g- chamber. The latter is also furnished with double doors, the inner being usually of glass. Heat is supplied from a burner fixed below. These burners vary much in design. Some- times a mechanism devised in Koch's laboratory is affixed, which automatically turns off the gas if the light be accidentally exting
. Manual of bacteriology. Bacteriology. STORING AND INCUBATION OF CULTURES. 83. Fig. 47. — Reichert's gas regulator. between which some fluid (water or glycerin and water) is placed, which, when raised to a certain temperature, ensures a fairly constant distribution of the heat round the g- chamber. The latter is also furnished with double doors, the inner being usually of glass. Heat is supplied from a burner fixed below. These burners vary much in design. Some- times a mechanism devised in Koch's laboratory is affixed, which automatically turns off the gas if the light be accidentally extinguished. Be- tween the tap supplying the gas, and the burner, is interposed a gas regulator. Such regulators vary in design, but for ordinary chambers which require to be kept at a constant temperature, Reichert's is as good and simple as any and is not expensive. It is shown in Fig. 47. / It consists of a long tube f closed at the lower end, ^ open at the upper, and furnished with two lateral tubes. The lower part is filled with mercury up to a point above the level of the lower lateral tube. The end of the latter is closed by a brass cap through which a screw d passes, the inner end of which lies free in the mercury. The height of the latter in the perpendicular tube can thus be varied by increasing or decreasing the capacity of the lateral tube by turning the screw a few turns out of or into it. Into the upper open end of the perpendicular tube fits accurately a bent tube, g, drawn out below to a comparatively small open point, c, and having in its side a little above the point a minute needle-hole called the peephole or bye-pass e. To fix the apparatus the long mercury bulb is placed in the jacket of the chamber to be controlled, tube a is connected to gas supply, tube b with the burner. The upper level of the mercury should be some distance below the lower open end of tube c. The burner is now lit. The gas passes in at a through c and e and out at b to the burner. When th
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