Pfund’s combination of the McLeod and Pirani pressure gages was studied with a number of gases. The calibration curves of pressure against galvanometer reading were found to be straight lines and, except for hydrogen, nearly interchangeable for all the gases used. By using a galvanometer of high sensitivity and introducing a compensating filament, the sensitivity of the gage was increased until a change in pressure of 1.5×10−9 mm of mercury would cause a change in deflection of 1 cm on the galvanometer scale.
Brief comments are made on the release of carbon monoxide and air from coconut charcoal and on the adsorption of air at low pressure by silica gel.
© 1924 Optical Society of AmericaFull Article | PDF Article
More Like This
Frederick G. Keyes and Jane Dewey
J. Opt. Soc. Am. 14(6) 491-504 (1927)
Crandall Z. Rosecrans
J. Opt. Soc. Am. 8(6) 783-786 (1924)
Franklin E. Poindexter
J. Opt. Soc. Am. 9(5) 629-634 (1924)