AIP History Center Newsletter
Volume XL , No. 1, Spring 2008
 

Examining the F.P. -54 Pirotron tube
Edwin B. Frost, Christian T. Elvey, and Otto Struve examining the F.P.-54 Pirotron tube used to direct light from Arcturus into the photoelectric relay for the opening of Chicago’s Century of Progress Exposition, Yerkes Observatory, circa 1933. Archival Photographic Files, Special Collections Research Center, University of Chicago Library.

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