Accession No

5886

Brief Description

screw-micrometer eyepiece, by W. Watson and Sons, Ltd., English, 1940 (c)

Origin

England; London

Maker

W. Watson and Sons, Ltd.

Class

microscopes

Earliest Date

1940

Latest Date

1940

Inscription Date

Material

cloth (velvet, synthetic); metal (brass, aluminium, one other white metal); glass; [wood]

Dimensions

Box width 91 mm; length 71 mm; depth 37 mm

Special Collection

Provenance

Donated on 01/11/2002.

Inscription

On micrometer:
W. Watson & Sons, Ltd
London

Description Notes

Push fit eyepiece in aluminium, with smaller push fit eye lens inscribed with the Watson logo and “X 6” (this is the only value eye lens extant). The eyepiece is dissected by an aluminium box which contains a serrated micrometer, the box carries the Watson inscription.

This micrometer is of an unusual type, as it carries no markings. The distance of the serrations is irrelevant and measurements are made possible by the fact that they are equidistant. For non-comparitive measurments a stage micrometer would be needed.

Fine focus is achieved by adjusting a wheel numbered “0” to “90” in increments of 10, this is turned by a large knurled wheel and there is an indicating pointer in enamelled metal on the box. Underneath the box is attached a clamp for securing the eyepiece to the microscope, this is tightened by a knurled screw. Contained in a velvet lined box (probably wood, lined with cloth) which has a gold embossed Watson logo on the lid.

References

Events