Aeronautic Instruments. Section II : Altitude Instruments (1923)
NASA Technical Reports Server (NTRS) · leaf 19
ALTITUDE INSTRUMENTS. 19 Figure 19 shows the mercurial standards and a vacuum control board of special design used in aneroid testing. Below is a large reserve vacuum tank. The tank is of value in mini- mizing the effect of slight leaks that may occur in the system. This arrangement of barometers… … Fig. ly.—?'Mercurial standards and vacuum control board. different containers simultaneously, so that instruments of different ranges may be tested in the shortest time. Also it facilitates the calibration of the mercurial standards, which were submitted to the Bureau of Standards during the war in…
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