. Radiometric action of light and heat on suspended gold leaves in high vacua . down the tube, only to reappearat the top a little later. The pump next tried was the Gaede rotary mercury purap^.See Plate I, Fig. 1. When this pump was attached to the 500 gauge with a preliminary exhaustion of cm. produced by amotor driven Geryk, the following readings were taken. Table I. Time pressure tube volume tube pressure 10:00 cm. 10:01 cm. cc. mm. 10:03 - 10:06 10:15 10:50 11:50 The system was lef
. Radiometric action of light and heat on suspended gold leaves in high vacua . down the tube, only to reappearat the top a little later. The pump next tried was the Gaede rotary mercury purap^.See Plate I, Fig. 1. When this pump was attached to the 500 gauge with a preliminary exhaustion of cm. produced by amotor driven Geryk, the following readings were taken. Table I. Time pressure tube volume tube pressure 10:00 cm. 10:01 cm. cc. mm. 10:03 - 10:06 10:15 10:50 11:50 The system was left standing until 5:00 to test for leaks. The reading showed a small increase in the pressure, which might have been due to gas given out by the walls of the gauge, or to a leak. At 5:30 pumping was continued as indicated in table II. Table II. Time pressure tube volume tube pressure 5:30 cm. 0,01 cc. mm. 5:32 5:35 5:38 5:42 .1 Phys. Zeitschr. , vol. 6, pp. 758-760, November 9, 1 4 Although pumping was continued for more than an hour, therewas no change in the degree of exhaustion. Probably the rate of ex-haustion was offset by the rate of leak, and by the gas that wasgiven off from the walls of the vessel where it had condensed. Thesystem was left until next morning, when the pressure was , a change that indicates a leak. This difference ( mm.)divided by the time gives a leak of 0,000004 mm. per minute for theinterval. The rate of leak may have been slowly increasing, for dur-ing the next two hours it figured mm. per minute. The onlyseals in the system were those in the manometer portion of the Gaedepump. They were ground glass lubricated with vaseline. At the pump was started again, but for some rea-son the pressure at starting was not recorded. It can be found fromthe rate of leak given. The readings were as follows: Table III. Time pressure
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