The calibration of the Waller gas balance and the Connell anaesthetometer / by W.M. Boothby and I. Sandiford.

  • Boothby, Walter M.
Date:
[1914?]
Catalogue details

Licence: In copyright

Credit: The calibration of the Waller gas balance and the Connell anaesthetometer / by W.M. Boothby and I. Sandiford. Source: Wellcome Collection.

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    when I?' = 0.1542 cc. D = 0.716 T = 4 A' then = 0.9911 gram the weight of air at 630 mm. and 21°, and 40 per cent saturated. 0.1542 X 0.716 X 4 0.4416 + 0.9911 [4 + (4 X 0.065)] weight. 0.4416 4.6637 = 9.47 per cent by BAROMETER PER CENT BY WEIGHT PER CENT BY VOLUME TENSION mm. mm. Colorado Springs (6000 feet).. 630 9.47 3.98 25.1 Sea-level. 780 7.78 3.24 25.3 The trip-valves of the additional fourth unit put on by Dr. Con¬ nell for mixing true gases, are not sufficiently accurate to jus¬ tify their use. SUMMARY 1. The calculations necessary for calibrating the Waller gas balance for ether are given in detail. Tables are appended to simplify the corrections needed for variations in barometer, tem¬ perature, water vapor, and alcohol content of ether. It is prob¬ able that the corrected tension is accurate to within =*= 0.2 mm. 2. By means of the Waller gas balance, thus calibrated, the Connell anaesthetometer has been tested and it was found that the tension of ether delivered by our apparatus was on the aver¬ age 2.1 mm. too high, the maximum error being +3.3 mm. The Connell apparatus adjusts itself to atmospheric conditions if the ether delivery is expressed in tension and not in percentages.