Accession No

1068

Brief Description

wedge photometer, by Adam Hilger, English, 2/2 19th Century

Origin

England; London

Maker

Adam Hilger

Class

optical

Earliest Date

1850

Latest Date

1900

Inscription Date

Material

wood; metal (brass, oxidised brass, steel, white metal); glass; cloth (velvet)

Dimensions

length 170mm; breadth 203mm; depth 85mm box length 228mm; breadth 192mm; height 117mm

Special Collection

Provenance

Donated by the Solar Physics Laboratory, University of Cambridge in 07/1951

Inscription

‘A. HILGER LONDON’

Description Notes

Oxidised brass plate with brass tube set perpendicular to the back of it; tube has slit for admittance of diaphragm with six different settings ranging from 1/100 to 1/2. Front of plate carries white metal scale which moves on rack and pinion mechanism, by rotation of knurled brass screw; scale divided 0 - [6.5], numbered by 1, subdivided to 0.1. Positioned opposite the end of the tube is a small screw-in aperture; four different apertures for 1/4, 1/8, 1/10 and 1/12.
Fitted wooden box with brass hinges and lock (no key); partially lined with blue velvet.

Condition good; complete.

References

Events