Abstract
REPORTING recently on the vacuums produced by diffusion pumps, Ray and Sengupta1 quote my statement "that the limit of pumping is set at the vapour pressure of the pump fluid at room temperature" and then proceed to take gentle issue with me. The correctness of my statement and of their counter-findings are, surely, both a matter of definition.
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References
Ray, K., and Sengupta, N. D., Nature, 155, 727 (1945).
Langmuir, I., Gen. Elec. Rev., 1060 (1916).
Burch, C. R., Nature, 122, 729 (1928).
Hickman, K. C. D., J. Franklin Inst., 221, 383 (1936).
Hickman, K. C. D., Chem. Rev., 34, 51 (1944).
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HICKMAN, K. Performance of Diffusion Pumps. Nature 156, 635–636 (1945). https://doi.org/10.1038/156635a0
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DOI: https://doi.org/10.1038/156635a0
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