. Radiometric action of light and heat on suspended gold leaves in high vacua . Digitized by the Internet Archivein 2013 RADIOMETRIC ACTION OF LIGHT AND HEAT ON SUSPENDEDGOLD LEAVES IN HIGH VACUA BY CLAUDE WILLIAMSON SANDIFURA, B. Indiana University, 1906 THESIS Submitted in Partial Fulfillment of the Requirements for the Degree ofMASTER OF ARTSIN PHYSICS IN THE GRADUATE SCHOOL OF THE UNIVERSITY OF ILLINOIS1909 UNIVERSITY OF ILLINOIS THE GRADUATE SCHOOL May 15, 190 9 I HEREBY RECOMMEND THAT THE THESIS PREPARED UNDER MY SUPERVISION BY CLAUDE WILLIAMSON
. Radiometric action of light and heat on suspended gold leaves in high vacua . Digitized by the Internet Archivein 2013 RADIOMETRIC ACTION OF LIGHT AND HEAT ON SUSPENDEDGOLD LEAVES IN HIGH VACUA BY CLAUDE WILLIAMSON SANDIFURA, B. Indiana University, 1906 THESIS Submitted in Partial Fulfillment of the Requirements for the Degree ofMASTER OF ARTSIN PHYSICS IN THE GRADUATE SCHOOL OF THE UNIVERSITY OF ILLINOIS1909 UNIVERSITY OF ILLINOIS THE GRADUATE SCHOOL May 15, 190 9 I HEREBY RECOMMEND THAT THE THESIS PREPARED UNDER MY SUPERVISION BY CLAUDE WILLIAMSON SANDIPUR ENTITLED HADIOMETRIO ACTION OP LiaHT AND HEAT ON SUSPENDED (JQLD LEAVESIN HIan VACUA BE ACCEPTED AS FULFILLING THIS PART OF THE REQUIREMENTS FOR THE DEGREE OF Master of Artsin Physics. In Charge of Major Work Head of Department Recommendation concurred in: Committee on Final Examination 145111 uiuc In an article by Bottomley and P. A. King^ entitledExperiments with Vacuum Gold-leaf Electroscopes on the MechanicalTemperature Effects in Rarefied Gases, attention is called to theaction of gold leaves in a highly exhausted vessel when subjectedto radiant heat and light. They explain that the observations were the result of anattempt to increase the degree of exhaustion of a radium clockby use of the Bunsen burner. The radium clock^ consists of a high-ly exhausted vessel in which are two gold leaves hanging paralleland close together with a bit of radio-active material above. Theleaves, charged by the action of the radio-active substance, di-verge until they strike earthed conductors on the sides of the con-taining vessel, when they are discharged and fall together. By chance the Bunsen burner was left standing near theclock, and it was observed that the leaves no lradiometricactio00sand
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