Aeronautic Instruments. Section VI : Oxygen Instruments (1923)
NASA Technical Reports Server (NTRS) · leaf 19
r between tests and breaking the seal. The bell jar rests upon a rubber gasket fastened to the base plate with shellac. Glycerine is used to insure an air-tight connection between the bell jar and the gasket. The mercury manometer M, which is connected to the bell jar, is of the closed cistern… … Fig. 19.—Bureau of Standards O.xygen Apparatus Testing Equipment. that it indicates the absolute pressure in the bell jar irrespective of the fluctuation in the exter- nal atmosj)heric pressure. The slider S (fig. 19), which can be moved tln-ougliout the range of the scale, is provided with two…
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