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specific gravity balance
specific gravity balance

specific gravity balance

Date1930-1950
Inventory Number1998-1-0107
ClassificationBalance
Subject
    User Michael A. Crawforth pub. 1979 - 1987
    Maker Griffin & Tatlock Ltd. 1929 - 1954
    User Department of Geology and Geography, Harvard University 1890 - 1961
    Cultural Region
      Place of Origin
        Dimensions16.5 x 57.4 x 6.3 cm (6 1/2 x 22 5/8 x 2 1/2 in.)
        box: 4.9 x 60 x 12.8 cm (1 15/16 x 23 5/8 x 5 1/16 in.)
        Material
          Accessoriescarrying box
          DescriptionA long brass beam with numbers inscribed on it and with a pivot close to one of its ends. (The pivot would be at 0 if the numbers continued). It is supported by two metallic stands that have brass discs as feet. The one that holds the pivot from below becomes a center of rotation or balance, while the other simply restricts the vertical movement of the bar leaving some room for movement. In addition to this, there is one metallic disc with a holder that allows it to slide on the beam. The whole set is stored in a box when not in use.
          Signedon label in case: GRIFFIN & TATLOCK LTD. on beam: GRIFFIN LONDON
          Inscribedmarked inside: "JWL" for J.W. Lunn
          Functionx
          See the following website for the description of a similar balance.
          ProvenanceDepartment of Geology and Geography, Harvard University. Transferred to CHSI May 13, 1968.
          Westphal specific gravity balance
          Westphal specific gravity balance
          Scientific Materials Company
          Date: 1902-1925
          Accessories: hook; riders (4); immersion thermometer with hook in wooden holder
          Object number: 3826
          Westphal specific gravity balance
          Westphal specific gravity balance
          Georg Westphal
          Date: circa 1893
          Accessories: slotted wooden arm; immersion thermometer on wire with hook; two extra wires sewed to blue paper; tweezers; riders in cylindrical cardboard box (in larger box)
          Object number: 3827
          Westphal specific gravity balance
          Westphal specific gravity balance
          Fisher Scientific Company
          Date: circa 1963
          Accessories: Reimann thermometer-Plummet, cat. no. 2-155 No 4402 WK missing glass jar (pygnometer?); one rider
          Object number: 1998-1-0090a
          triple beam balance
          triple beam balance
          Central Scientific Company
          Date: circa 1929
          Object number: 1988-0001a-c
          two pan Roberval balance
          two pan Roberval balance
          Henry Troemner Company
          Date: 1900-1930
          Object number: 1998-1-0092
          folding brass foot rule
          folding brass foot rule
          Michael Butterfield
          Date: circa 1700
          Object number: DW0740
          balance
          balance
          L. E. Knott Apparatus Company
          Date: 1910-1920
          Accessories: steel weight trays (2)
          Object number: 2004-1-0305
          dial reading chainomatic analytical balance
          dial reading chainomatic analytical balance
          American Balance Corporation
          Date: circa 1960
          Accessories: brush; aluminum blocks
          Object number: 1996-1-0204
          Pulfrich refractometer by Zeiss
          Pulfrich refractometer by Zeiss
          Carl Zeiss Jena
          Date: circa 1926
          Accessories: wooden box with two hook-and-eye latches to fasten front opening; in instrument file: instruction book (photocopy); Geissler tube labeled "H2"; carboard tube containing German thermometer C in stainless steel holder that screws into instrument; glass bottle with cork stopper labeled "Monobromnaphthalin, Germany nD=1 658"; small round cardboard box labeled "For Pulfrich Refractometer" containing one tubulure
          Object number: 1996-1-0229
          single-pan substitution balance
          single-pan substitution balance
          E. Mettler AG
          Date: 1955-1965
          Accessories: instruction manuals
          Object number: 1996-1-0203
          Harvard trip scale
          Harvard trip scale
          E. and T. Fairbanks and Co.
          Date: circa 1890
          Object number: 1998-1-0106
          column-reading chainomatic analytical balance
          column-reading chainomatic analytical balance
          Eimer & Amend
          Date: circa 1922
          Accessories: set-up instructions; weights; corked glass viles; tweezer; magnifying glass
          Object number: 1996-1-0207