. Radiometric action of light and heat on suspended gold leaves in high vacua . nd theloop is the receptacle C that contained the charcoal. The totalvolume of the part shown is 400 cc. Before sealing onto the gaugethe loop P was immersed in liquid air and kept immersed until theobservations were completed. The object of immersing the loop wasto condense all moisture or mercury vapor before it reached the leaves Because charcoal does not absorb argon, helium, and theother inert gases in the air, it was desirable that they be removedif possible before the charcoal was immersed in liquid air. Thi


. Radiometric action of light and heat on suspended gold leaves in high vacua . nd theloop is the receptacle C that contained the charcoal. The totalvolume of the part shown is 400 cc. Before sealing onto the gaugethe loop P was immersed in liquid air and kept immersed until theobservations were completed. The object of immersing the loop wasto condense all moisture or mercury vapor before it reached the leaves Because charcoal does not absorb argon, helium, and theother inert gases in the air, it was desirable that they be removedif possible before the charcoal was immersed in liquid air. This iswhy the pump was used at all at this time. The method used in ex-hausting was the following; while the pump was running, the charcoalwas heated until quite warm. The mercury valve was then closed andthe charcoal allowed to cool. In cooling to room temperature, thepressure was reduced from mm. to mm. The system was leftstanding over night with the pressure as low as possible. The read-ing the next morning was such that it assured that there was no leak. Plate


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