Document ybm0YomrgO53NrGQ69XRJKo3D

CONI'IIIIINTI Al. ]S1kllon Institute of Industrial Research UNIVERSITY OF PITTSBURGH PLAINTIFF'S EXHIBIT PROGRESS REPORT for the veek ended June 3, 19^9 INDUSTRIAL 5YGIh~N2 FOUNDATION Subjects under which report is to be indexed Industrial Fellowship No. 259"15 Several days vere spent counting dust samplsfl--from Corhart Refractories. The Canadian dust samples were also counted. Difficulties were encountered in obtaining check counts. The longer the samples stood, the higher the count, which seemed to infer that something vas being leached out of the .rubber stoppers . Two spirals from Corhart Refractories were ^broken down and counted by the regular technique.: . ' The Pittsburgh Plate Glass size_-separations were completed and Bent.to Chemical PhyBics for x-ray diffraction analysis for free silica. ;; .' .7 - . *:' <V' ' * >* , '* ` R: June--7, 19^9 T: June 9, 19*9 R: !% .*_ ; V V-- -J 7T \ 000045