Compressed air; theory and computations . ruling of the scale extending under botharms of the gage. The readings to be taken with the assistanceof a small draftsmans triangle held with the side resting againstthe vertical glass tube and edge against the scale, parallax beingavoided by bringing the eye so that the upper edge of the tri-angle and the lines on the scale are projected parallel and bothseen crossing the gage column as illustrated in the photograph.(Note that the eye of the camera was not in the correct position.) Art 24. Apparatus for Measuring Air Under Pressure withStandard Orifi
Compressed air; theory and computations . ruling of the scale extending under botharms of the gage. The readings to be taken with the assistanceof a small draftsmans triangle held with the side resting againstthe vertical glass tube and edge against the scale, parallax beingavoided by bringing the eye so that the upper edge of the tri-angle and the lines on the scale are projected parallel and bothseen crossing the gage column as illustrated in the photograph.(Note that the eye of the camera was not in the correct position.) Art 24. Apparatus for Measuring Air Under Pressure withStandard Orifices.—In the ordinary case when it is desired toknow the quantity of compressed air passing through a pipe with- 42 COMPRESSED AIR out sacrificing the pressure, the orifice drum must be made strongenough to withstand the high pressure and the U-gage de-scribed in the previous case must be replaced by a differentialgage which must also be strong enough to withstand the pres-sure. The essentials are embodied in the illustration, Fig. 10,. Fig. 9a.—Method of reading water gages. which also suggests a convenient scheme for attachment to anair main. The several essentials are: F1F2F3 = valves for controlling the path of the air,U = unions for detaching apparatus,6&2&3 = baffles for steadying the current of air, MEASUREMENT OF AIR 43 0 = orifice, T = thermometer set through a gland,G = pressure gage,gg2 = glass columns of the differential gage,C = cocks for convenience in manipulating the differ-ential manipulation of the apparatus Fig. 10, is as follows:To charge the differential gage close C\, d and C5, open C2 andC3 and pour in the desired amount of liquid. Then close C2 andC3 and open d and d. To pass the air through the measuring drum, open F2 and V3and close Vi. Note: Both legs of the gageshould be tapt into the drum closebeside the orifice.
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