Geiger counter with a “FRANK HARTMAN / RADIUM PRODUCTS / 1921 WALNUT ST. / PHIL. PA.” inscription. When the United States entered World War I, Frank Janczak Hartman (1893-1986) was recruited by the ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Original BS-1 Geiger counter ...
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