Abstract

<p>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<sup>-9</sup> mm of mercury would cause a change in deflection of 1 cm on the galvanometer scale.</p><p>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.</p>

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  1. A. H. Pfund. Phys. Rev. Series 2, 18, p. 78; 1921.
  2. M. v. Pirani. Ber. d. Deutsch. Phys. Gesell. 4, p. 687; 1906.
  3. C. F. Hale. Trans. American Electrochem. Soc. A 20, p. 243; 1911.
  4. F. Soddy and A. J. Berry. Proc. Roy. Soc. A 83, p. 254; 1909. ibid. A 84, p. 576; 1910.
  5. I. Langmuir. Phys. Rev. Series 2, 1, p. 337; 1913.
  6. S. Dushman. Phys. Rev. Series 2, 5, p. 213, 1915.
  7. J. E. Shrader and R. G. Sherwood. Phys. Rev. Series 2, 12, p. 70; 1918.
  8. M. Knudsen. Ann. d. Phys. 32, p. 809; 1910.
  9. O. E. Buckley. Proc. Nat. Acad. Sci. 2, p. 683; 1916.

Berry, A. J.

F. Soddy and A. J. Berry. Proc. Roy. Soc. A 83, p. 254; 1909. ibid. A 84, p. 576; 1910.

Buckley, O. E.

O. E. Buckley. Proc. Nat. Acad. Sci. 2, p. 683; 1916.

Dushman, S.

S. Dushman. Phys. Rev. Series 2, 5, p. 213, 1915.

Hale, C. F.

C. F. Hale. Trans. American Electrochem. Soc. A 20, p. 243; 1911.

Knudsen, M.

M. Knudsen. Ann. d. Phys. 32, p. 809; 1910.

Langmuir, I.

I. Langmuir. Phys. Rev. Series 2, 1, p. 337; 1913.

Pfund, A. H.

A. H. Pfund. Phys. Rev. Series 2, 18, p. 78; 1921.

Pirani, M. v.

M. v. Pirani. Ber. d. Deutsch. Phys. Gesell. 4, p. 687; 1906.

Sherwood, R. G.

J. E. Shrader and R. G. Sherwood. Phys. Rev. Series 2, 12, p. 70; 1918.

Shrader, J. E.

J. E. Shrader and R. G. Sherwood. Phys. Rev. Series 2, 12, p. 70; 1918.

Soddy, F.

F. Soddy and A. J. Berry. Proc. Roy. Soc. A 83, p. 254; 1909. ibid. A 84, p. 576; 1910.

Other (9)

A. H. Pfund. Phys. Rev. Series 2, 18, p. 78; 1921.

M. v. Pirani. Ber. d. Deutsch. Phys. Gesell. 4, p. 687; 1906.

C. F. Hale. Trans. American Electrochem. Soc. A 20, p. 243; 1911.

F. Soddy and A. J. Berry. Proc. Roy. Soc. A 83, p. 254; 1909. ibid. A 84, p. 576; 1910.

I. Langmuir. Phys. Rev. Series 2, 1, p. 337; 1913.

S. Dushman. Phys. Rev. Series 2, 5, p. 213, 1915.

J. E. Shrader and R. G. Sherwood. Phys. Rev. Series 2, 12, p. 70; 1918.

M. Knudsen. Ann. d. Phys. 32, p. 809; 1910.

O. E. Buckley. Proc. Nat. Acad. Sci. 2, p. 683; 1916.

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