Accession No

3113

Brief Description

prism train for spectroheliograph, by Adam Hilger, English, c. 1905

Origin

England; London

Maker

Adam Hilger [prism 2]

Class

optical

Earliest Date

1901

Latest Date

1905

Inscription Date

Material

glass; paint; wood; metal (steel, brass, another)

Dimensions

prism 2: height 173mm; breadth 174mm; depth 135mm other non-triangular prism height 168mm; breadth 131mm; depth 150mm holder for prism length 445mm; breadth 180mm; height 250mm box length 485mm; breadth 220mm; height 265mm box 2 length 430mm; breadth 350mm; height 295mm triangular prism depth 191mm; breadth 160mm; height 167mm

Special Collection

Provenance

Transferred from Institute of Astronomy, University of Cambridge, Cambridge, England, 12/1983. Part of spectroheliograph which was given to the SPO, Cambridge by the SPO, South Kensington in 1913.

Inscription

‘REFIGURED
BY
A.H.’ (top of prism 2)

Description Notes

Prism train for spectroheliograph, by Hilger, English, c. 1905.

Four prisms for spectroheliograph; two triangular, two with oval faces; each has one face silvered for reflection of light. Top and bottom painted with black paint.

Black-painted metal holder for triangular prisms with brass mounting pieces on the sides.

Two wooden crates for transportation of prisms; one holds both triangular prisms, the other is empty. The latter is marked ‘Case for 6´´ 45˚ Hilger Prism used Canada Aug 1932’.

Condition good; complete.

References

Events