Abstract
IN the decade after Burch introduced petroleum oils1 as working fluids for the Langmuir condensation pump, the silicones, octyl alcohol esters and petroleum pump fluids converged to a low-pressure optimum at about 10−7 mm. mercury, which the succeeding 20 years has lowered, perhaps, to 5 × 10−8 in an untrapped three-stage glass pump when measured at an ambient temperature of 25° C.
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References
Burch, C. R., Nature, 122, 729 (1928).
“Meta- Poly Phenyl Ethers: Synthetic Lubricants of the Future”, Hamman, W. C., and Blake, E. S., presented at the Boston meeting of the American Chemical Society (April 1959).
Bayard, R. T., and Alpert, D., Rev. Sci. Instr., 21, 571 (1950).
Newell, H. E., Science, 131, 385 (1960).
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HICKMAN, K. Pump Fluids for Higher Vacuums. Nature 187, 405–406 (1960). https://doi.org/10.1038/187405b0
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DOI: https://doi.org/10.1038/187405b0
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