Accession No

1533

Brief Description

achromatic compound microscope, petrological, “Advanced Student” model, by J. Swift and Son, English, 1940 (c)

Origin

England; London

Maker

J. Swift and Son

Class

microscopes

Earliest Date

1940

Latest Date

1940

Inscription Date

Material

metal (steel, aluminium, brass); glass; wood

Dimensions

box height 425mm; depth 232mm; breadth 180mm

Special Collection

Provenance

Transferred from the Sedgwick Museum of Earth Sciences, University of Cambridge.

Inscription

‘J Swift & Son
London
19876.’

Description Notes

“Advanced Student” model; black finish with steel and aluminium screws and fittings; horse shoe foot; double stand to pivoting joint; arched limb; circular stage with knurled, graduated edge 0- (360) by 10 to 1 on outer ring; vernier to 5’; brass top - stage with clips; rack to substage with a dovetailed shoe; condenser, with top lens on a pivoting mount so that it can be thrown out of the optical axis; iris diaphragm; polariser with a divided flange 0 - (360) by 45, mounted on a swinging arm; swinging plano / concave mirror; pair of coarse focus screws on either side of limb by diagonal rack and pinion; pair of fine focus screws either side of body acting by screw micrometer, milled head divided 0 - (10) by 1 when ‘1 Div = .01mm’; push fit eye piece with cross hairs with slot for micrometers, compensators etc.; aluminium flange at the top of the body for a cap analyser or Becke lens; slot through the upper body carries a Bertrand Lens in a focussing mount; second below the analyser which slides in and out of the lower end of the body; double nosepiece; fitted wooden box.

References

Events