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• barometer #10011
  
• X-ray tube #10012
  

#10011: Fortin Barometer J.A. Green, New York In a Fortin barometer the level of the mercury in the glass at the bottom is adjusted to a fiducial mark, and the column height is measured against this mark. The barometer features a thermometer, is mounted in a wooden case, and comes with framed instructions. Engraved serial number #1626. Reference: none IU tag number: 70-29-9496

#10012: X-ray Tube General Electric, around 1920 Glass ball is 17.8 cm in diameter. Etched marking: Coolidge tube #32655.This "Universal" Coolidge tube was manufactured by General Electric, probably in the early 1920s. The last patent date on the tube was January 1917. Reference: http://www.orau.org/ptp/collection/xraytubescoolidge/coolidgeinformation.htm; http://www.orau.org/ptp/collection/xraytubescoolidge/coolidge.htm IU tag number: none