achromatic objective, Epi 40/0.65

Datecirca 1960

Inventory Number1997-1-2087

ClassificationMicroscope Optics

Subject

Maker Wild Heerbrugg Ltd. 1921 - 1989

Supplier Wild Heerbrugg Instruments Inc. founded circa 1955

Cultural Region

Place of Origin

Dimensionsobjective: 4.1 × 2.4 × 2.4 cm (1 5/8 × 15/16 × 15/16 in.)
5.5 × 3 × 3 cm (2 3/16 × 1 3/16 × 1 3/16 in.)

Material

DescriptionAchromatic objective, Epi 40/0.65. Consists of a silver-colored, spring-loaded tube with a black milled collar.

In Collection(s)

Wild M20 Compound Microscope

Signedon side of tube: WILD / HEERBRUGG / SWITZERLAND

Inscribedon one side of tube: Epi 40 / 0,65 / d = 0 on other side, beneath maker's mark: 55257

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." This objective is intended to be used without a cover glass (per David P. Wheatland's note).

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. The initial cost of the purchase was $6000.