Accession No

1534

Brief Description

achromatic compound microscope, petrological, “Survey” 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 (brass, steel, aluminium); glass; wood; lacquer

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
19695’

Description Notes

“Survey Model”; brass; black finish with steel and aluminium screws and fittings. Horseshoe base; double stand to pivoting, arched limb; circular stage; knurled aluminium ring divided 0- (360) by 10 to 1, read by vernier to 5’; lacquered brass top stage with clips; rack for substage with dovetailed shoe; condenser with top lens which is mounted on an arm and swings out of the optic axis; iris diaphragm; ? stop which swings out; polariser with a flange divided 0 - (360) by 45 also on an arm so that it can swing out of the optic axis; pair of coarse focus screws either side of limb; pair of fine focus screws divided 0 - (10) by 1 where ‘1 Div = .01mm’ limb divided 0-50mm; push fit eyepiece with a slot to carry a micrometer etc.; slot in the upper part of the body for a Bertrand lens and a iris diaphragm; graduations along the edge of the slot 0 - 10 by 1; slot in the bottom end of the body tube for polariser with a flanged collar over graduated 0 90 by 45; triple nose piece; 3 objectives in original cases 1in, 1/2in, 1/4in; further slot in nose piece [analyser]. Fitted wooden box.

References

Events