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aperture?
aperture?

aperture?

Date1900-1950
Inventory Number1997-1-0058
ClassificationCamera Part
Subject
    Cultural Region
      Dimensions14.4 × 1.2 × 14.4 cm (5 11/16 × 1/2 × 5 11/16 in.)
      Material
        DescriptionCorroded metal disc with a central opening that has a grooved lining. Possibly the aperture attachment to an older camera. There are two small holes towards the edge of one side of the disc, running perpendicular to the circumference, and 4 small nails.

        Has orange H on it, which was often used to identify instruments from the physics department at Harvard.
        Signedunsigned
        perspektomat P-40 pantograph
        Forster
        Date: 1950-1960
        Accessories: spare ink cartridges; pen attachments am auxiliary box containing small Allen wrench, scotch tape, extra parts, and storage instructions
        Object number: 1999-1-0054
        Harvard Project Physics student slide chart
        Perrygraf
        Date: 1962-1972
        Object number: 1991-1-0008
        Harvard Project Physics student slide chart
        Perrygraf
        Date: 1962-1972
        Object number: 1991-1-0009
        solar microscope fashioned from screw-barrel simple microscope
        Edward Bromfield
        Date: circa 1745
        Accessories: storage box (1169b); accessories box (1169c)
        Object number: 1169a
        Olivier geometric string figure of a cylinder
        Fabre et Cie
        Date: circa 1856
        Object number: 5467
        Lowry-Bowyer telemeter
        Lowry Manufacturing Company
        Date: 1896
        Object number: 5331
        centigraph
        American Adding Machine Company
        Date: circa 1891
        Object number: 5402
        hydraulics slide chart
        Robert E. Martin
        Date: ca. 1940-1970
        Accessories: manila envelope
        Object number: 1997-1-1616
        hydraulics slide chart
        Robert E. Martin
        Date: ca. 1940-1970
        Accessories: square manila envelope
        Object number: 1997-1-1614
        polarization photometer
        Bausch & Lomb Optical Company
        Date: circa 1930
        Object number: 1996-1-0722
        transformer
        ACME Apparatus Company
        Date: 1930-1950
        Accessories: handle; black cylindrical component; wrapping newspaper
        Object number: 1997-1-0516