vapor pressure apparatus
Date1870-1890
Inventory NumberDW0182
ClassificationChemistry Apparatus
Subject
Maker
E. Ducretet & Cie
1864 - 1931
Cultural Region
Place of Origin
Dimensions107.8 x 27.5 x 27.5 cm (42 7/16 x 10 13/16 x 10 13/16 in.)
bulb diameter: 9 cm (3 9/16 in.)
bulb diameter: 9 cm (3 9/16 in.)
Material
Bibliography
DescriptionA wood stand supporting two vertical glass tubes connected on their lower part by some metallic fittings. The wider tube leads to a platform higher up that holds a glass globe connected to the tube through a stopcock. The narrower tube rises higher than the globe.
Signedon scale: E. DUCRETET & CIE A PARIS
FunctionThis device would be useful for determining the vapor pressure of volatile liquids. One could fill the narrower tube entirely with mercury while the wider one would contain mercury but also some amount of the liquid to be examined floating above it. After draining some of the mercury, the weight of the mercury would create an evacuated space on top of both the narrow tube and the globe of the wider one, and part of the liquid would evaporate, until reaching the vapor pressure at the present temperature. This pressure would be expressed as a difference in heights between the mercury levels in both tubes which could be easily measured.
ProvenanceDavid Wheatland purchased from Roux-Devillas Paris, May 14, 1966 (lot 5/62).
Todd Scientific Company
Date: 1955-1965
Object number: 1996-1-0396
Fabre et Cie
Date: circa 1856
Object number: 5468
Richard W. Thomas
Date: circa 1861
Accessories: bottle and beaker (1998-1-1634a); hydrometer and manual (1998-1-1634b)
Object number: 1998-1-1634
French
Date: circa 1820
Accessories: detachable water spout
Object number: DW0820
E. Ducretet & Cie
Date: 1870-1890
Accessories: stand (DW0186b)
Object number: DW0186a
E. Malligand Fils
Date: circa 1875
Accessories: short cylindrical spirit burner with cap for wick
Object number: DW0889
Charles-Louis Chevalier
Date: circa 1820
Accessories: (b) glass cup (stored separately on same shelf); (c) long, Y-shaped brass tube (tied to pump)
Object number: DW0822a-c
Ashcroft Gauge Division of Manning, Maxwell, & Moore, Inc.
Date: circa 1930
Accessories: six weights ranging from 1/4 lbs to 4 lbs; instruction plate nailed into inside upper lid of box (copy in instrument's file); certificate of accuracy signed by Manning, Maxwell, & Moore's Chief Inspector, TM Perkins, Feb 27, 1963 (in instrument's file)
Object number: 1999-1-0061