Physics
Scientific paper
Jul 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960natur.187r.405h&link_type=abstract
Nature, Volume 187, Issue 4735, pp. 405-406 (1960).
Physics
Scientific paper
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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