. Radiometric action of light and heat on suspended gold leaves in high vacua . aled into the ends, one of which made a support for the leaves. Acopper wire connected the two pieces of platinum, thus the leavescould be earthed. Three small holes (c,d,f) were blown near the low-er end of this arm to allow the vessel to be exhausted. After theleaves were put into the case, mercury was poured over the stopperto make an air tight seal. This vessel was connected to the gauges, the gauges to amercuryvalve (see Fig. 2, Plate III), and the valve to the Gaedepump. The mercury valve is a U-shaped glass
. Radiometric action of light and heat on suspended gold leaves in high vacua . aled into the ends, one of which made a support for the leaves. Acopper wire connected the two pieces of platinum, thus the leavescould be earthed. Three small holes (c,d,f) were blown near the low-er end of this arm to allow the vessel to be exhausted. After theleaves were put into the case, mercury was poured over the stopperto make an air tight seal. This vessel was connected to the gauges, the gauges to amercuryvalve (see Fig. 2, Plate III), and the valve to the Gaedepump. The mercury valve is a U-shaped glass tub© about 80 ; at the curve a straight glass tube is connected which communi-cates with a mercury well through a rubber tube. By raising or low-ering the well, the height of the mercury in the arras of the valvecan be controlled. Near the top of each branch is a bulb to preventthe mercury from being thrown out by sudden changes in valve thus made is gas tight and since it is of barometricheight, will protect the system on either side against an accident. 10 on the other side. A 100 cc, gauge, made by Boehm, Chicago, was put inseries with the large gauge. It measures pressures ranging from to mm. It was needed for pressures higher than the largegauge would measure. After trouble with leaks around the ground glass joints onthe pump had been stopped, the exhausted system was left standingtwo or three days to allow any gas that would leave the walls time todo so. While working with leaks, I noticed a marked action of theleaves at higher pressures than I had expected. The divergence ofthe leaves due to a Bunsen burner 10 cm. away was 2 mm. when thepressure was ram. At ram. the divergence was 5 ram. Theeffect of an incandescent lamp (16 ), of the Bunsen burner flame10 cm. long, and of an ordinary gas flame all seemed the same. Several days were spent trying to get an exhaustion as com-plete as earlier uses of the pump led me to
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