Accession No

5250

Brief Description

uv-vis spectrophotometer, by Beckman, U.S.A., 1/2 20th Century

Origin

U.S.A.; California; South Pasadena

Maker

Beckman

Class

optical

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

metal (cast iron, white metal, brass); wood (cork); paper (cardboard and one other); plastic (foam and at least one other); rubber

Dimensions

length 775mm; breadth 240mm; height 182mm

Special Collection

Provenance

Transferred from Department of Physical Chemistry, University of Cambridge, Cambridge, England in 12/1986.

Inscription

‘BECKMAN
MODEL DU SER1485
QUARTZ SPECTROPHOTOMETER
NATIONAL TECHNICAL LABORATORIES
SOUTH PASADENA, CALIFORNIA, U.S.A.’ (plaque on top of instrument)

Description Notes

Black-painted cast iron (?) case set on three rubber feet. Attached to this is a specimen chamber set between metal, plastic and cardboard layers. Beyond this is black-painted white metal box which contains either the light source, the photographic film or both; three terminals on this box. On top of the main section are two dials; the larger is divided in a spiral 200 - 2000, 200 - 220 numbered by 1, 220 - 300 numbered by 2, 300 - 400 numbered by 5, 400 - 500 numbered by 10, 500 - 600 numbered by 20, 600 - 800 numbered by 25, 800 - 200 numbered by 50. Underneath this dial is a groove in which sits a pin attached to a metal rod which is fixed at one end and is also attached to a metal cable connected by a pulley system to a spring mounted on the top of the instrument. The smaller dial is divided 0 - 20, numbered by 0.1, subdivided to 0.025; 0 - 0.1 numbered 0.01, 0.02, 0.04, 0.06, 0.08 and subdivided to 0.0025. This dial has a toothed rim which turns against a cog on a vertical axis passing into the instrument.

Condition good; complete (?)

References

Events