Mercurial barometer

mercurial barometer

Mercurial barometer, stick type; nickel? scale and vernier; main scale graduated in inches and divided to 0.05 (scale 24.4" to 32.8"); vernier divided to 0.002" (scale -0.002" to +0.5"); vernier adjusting knob does not move vernier; attached mercury thermometer graduated -24 F to +140 F; ex-collection , Harris D. Rush (b. 1879), and Harris C. Rush (b. ca. 1850). LOA top of suspension ring to cistern knob 41".