Bourdon tube thermograph made by Richard Freres, Paris, 1882-1891
Object No. H8564
During the 1800s many new graph-producing instruments were designed, including this thermograph made by Richard Freres in France between 1882 and 1891. Its inventor, Jules Richard, developed a lightweight hollow pyramid-shaped pen, slow-drying ink that didn't clog the pen, and special paper to take the ink. The drum holding the paper was turned by a clockwork motor, and the curved, flattened alcohol-filled Bourdon tube held outside the case expanded and contracted in response to changes in ambient temperature, causing the pen to draw a curve on the paper. Debbie Rudder
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Summary
Object Statement
Thermograph, recording Bourdon tube thermometer driven by clockwork, metal / paint / paper / glass, Richard Freres, Paris, France, 1882-1891
Physical Description
Thermograph, recording Bourdon tube thermometer driven by clockwork, metal / paint / paper / glass, Richard Freres, Paris, France, 1882-1891
PRODUCTION
Notes
Jules Richard patent 1880, company called Societe Richard Freres from 1882, changed to Jules Richard in 1891
SOURCE
Credit Line
Gift of Dept of Health Sydney, 1969
Acquisition Date
26 June 1969
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