. Radiometric action of light and heat on suspended gold leaves in high vacua . e with glass tubing which had aninside diameter of at least 3 mm. They were fused together and an-nealed in position. Rubber tubing connections, even though protect-ed by mercury seals, were found unreliable. In Plate IV it will benoticed that the mercury valve was joined to the pump, next was thereceptacle for the charcoal, followed by the two gauges to thelarger of which the gold leaf vessel was attached. The only mer-cury seal in the system was the one closing the gold leaf were three ground glass j
. Radiometric action of light and heat on suspended gold leaves in high vacua . e with glass tubing which had aninside diameter of at least 3 mm. They were fused together and an-nealed in position. Rubber tubing connections, even though protect-ed by mercury seals, were found unreliable. In Plate IV it will benoticed that the mercury valve was joined to the pump, next was thereceptacle for the charcoal, followed by the two gauges to thelarger of which the gold leaf vessel was attached. The only mer-cury seal in the system was the one closing the gold leaf were three ground glass joints in the manometer portion of thepump, but when the mercury valve was closed, these were shut offfrom the highly exhausted part of the system. When pressures as low as to mm. were obtainedand held for a week, I began a series of readings to determine theeffect of change of pressure on the divergence of the leaves, andat what pressures the various sources of light and heat producedvisible effects. ^ Proceedings of the Roy. Soc, vol. 74, pp. 122-127. Plate 12 The readings were made on a millimeter scale which was fast-ened onto the front of a plane mirror. The mirror was set behind theleaves so that a horizontal line on the scale was 5 mm, above thelower end of the leaves when they were together in a vertical posi-tion. Below is given a series of readings that show the change indivergence with the corresponding change in pressure. Table IV. Pressure tube volume tube pressure divergence cm. cc. cm. mm. It II II It It II II II A repulsion as well as the divergence was observed at pres-sures below mm., , the leaf on the side away from the lampmoved farthest from the vertical position of the two. From the a-bove readings it was noticed that the maximum divergence was a
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