interference filter, 635 mu
Datecirca 1960
Inventory Number1997-1-2176
ClassificationFilter
Subject
Maker
Gerätebau-Anstalt, Balzers
founded 1946
Maker
Wild Heerbrugg Ltd.
1921 - 1989
Supplier
Wild Heerbrugg Instruments Inc.
founded circa 1955
Cultural Region
Place of Origin
Dimensionsfilter: 0.4 × 5 × 5 cm (3/16 × 1 15/16 × 1 15/16 in.)
case: 2.4 × 7.1 × 7.1 cm (15/16 × 2 13/16 × 2 13/16 in.)
case: 2.4 × 7.1 × 7.1 cm (15/16 × 2 13/16 × 2 13/16 in.)
Material
DescriptionAn interference filter stored in small faux leather black case. The filter is encased in plastic. Both the case and the filter are unsigned.
In Collection(s)
Signedunsigned
Inscribedengraved by hand on the corner of the filter: 1887-9
on tissue paper wrapping (discarded): red-green / 8103 / ok / 635mu
Curatorial RemarksThe original invoice for the Wild M20 compound microscope (in file) contains 152 items. Most accessories are catalogued under CHSI inventory numbers running from 1997-1-2062 to 1997-1-2223, and are stored separately. The microscope stand is 1997-1-0722 and the case is 1997-1-0723. All items are linked together in the Object Package "Wild M20."
Historical AttributesOn September 2, 1960, David P. Wheatland ordered a Wild research microscope, model M20 KGS along with a comprehensive assortment of accessories and nearly all the attachments offered. He told the Wild vendor that:
"It is intended to use all thse for comparison, demonstration, and some for investigation. Eventually perhaps other basic instruments may be ordered and the accessories distributed among them. We are anxious therefore to have the list as complete as possible to make all the tests and optical experiments."
DPW also ordered a complete set of brochures for the library.
Gerätebau-Anstalt, Balzers
Date: circa 1960
Object number: 1997-1-2178
Gerätebau-Anstalt, Balzers
Date: circa 1960
Object number: 1997-1-2179
Wild Heerbrugg Ltd.
Date: circa 1960
Accessories: case
Object number: 1997-1-2170
Wild Heerbrugg Ltd.
Date: circa 1960
Object number: 1997-1-2139
Constant Vérick
Date: circa 1875
Accessories: oculars (3): 1, 2, 3; objectives (7): 0, 2, 4, 6, 8, 10 water immersion (2); substage stops (3); condenser with aperture diaphragm wheel on dovetail slide; bullseye; revolving double nosepiece; spatula; blue glass filter; case; and key
Object number: 1012