Spirometer, Lowne or Casella, circa 1880

Based on the sheet in the background this is either a Lowne or Casella spirometer, and probably manufactured in England in the 1880’s.  It’s possible that Casella, a company that specialized in manufacturing scientific instruments, manufactured it based on a design by Lowne since the spirometers attributed to both of these sources look mostly identical.  Found on an auction website, The Saleroom.com.

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