Images(16)

set of epi-optical components

Datecirca 1960

Inventory Number1997-1-2187

ClassificationMicroscope Light Source

Subject

Maker Wild Heerbrugg Ltd. 1921 - 1989

Supplier Wild Heerbrugg Instruments Inc. founded circa 1955

Cultural Region

Place of Origin

Dimensionscase: 11.2 × 27.3 × 27.5 cm (4 7/16 × 10 3/4 × 10 13/16 in.)

Material

DescriptionIncident-light attachment and related accessories for the Wild M20 research compound microscope. All items are stored in a large black faux leather case, custom-cut and padded on the inside, and marked "M-20 Auflicht." The case contains the following: a drum-shaped incident-light casing; a low voltage lamp with a 6V/20W bulb; a lamp cable; a mounting pin; a revolving quad nosepiece; and three epi-objectives (10x, 20x, and 40x), each in its own plastic case.

Also included in the case is a high-power (100x) epi-objective, separately cataloged as 1997-1-2188.

In Collection(s)

Wild M20 Compound Microscope

Signedstamped on top of case (1) and on side of lamp (3): WILD / HEERBRUGG stamped on top of incident light casing (2), stamped into side of each objective (7, 8, 9), and molded into plastic on top of each objective's clear case: WILD / HEERBRUGG / SWITZERLAND

Inscribedcase (1): stamped on top: M-20 Auflicht incident light casing (2): stamped on top, directly beneath maker's mark: 5057 and 1,4x incident light casing (2): two characters stamped on top near edges: P and lambda [for wavelength?] incident light casing (2): stamped on top near dials: lambda [for wavelength] and Pol 10x epi-objective (6): stamped on side: Epi10 / 0,25 / 10134 20x epi-objective (7): stamped on side: Epi20 / 0,45 / 20195 40x epi-objective (8): stamped on side: Epi40 / 0,65 / 40121

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." The nine pieces listed as 1997-1-2187 refers to Part #8503, as listed in the invoice and cited in Prospectuses, pamphlet Mi 653 (see p. 6). The high-power (100x) epi-objective has a seperate part number on both the invoice and pamphlet (Part #8528), and has therefore been catalogued seperately as 1997-1-2188. The entire pamphlet refers to the incident-light attachment and its multiple accessories.

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.