Accession No

2573

Brief Description

spectro-helioscope slit, 1880 (c) (?)

Origin

Maker

Class

astronomy; optical

Earliest Date

1880

Latest Date

Inscription Date

Material

metal (brass, steel, cast iron)

Dimensions

height 310mm; breadth 205mm; depth 120mm

Special Collection

Provenance

Transferred from Institute of Astronomy, University of Cambridge, Cambridge, England, 5/6/1980. Transferred from Solar Physics Laboratory, Cambridge to the Institute of Astronomy, University of Cambridge, unknown date. Transferred to Cambridge University in 1913 when Solar Physics Laboratory, South Kensington moved to Cambridge (renamed Solar Physics Laboratory, Cambridge).   (?) originally owned by the Solar Physics Laboratory, South Kensington, London (founded 1878). 

Inscription

‘SOLAR PHYSICS 17’

Description Notes

Brass spectro-helioscope slit, steel jaws, mounted on cast iron mount. Slit width adjustable by micrometer screw, drum divided 0-0.0033 by 0.0001 moving over linear scale divided 0-0.08 by 0.0033. Slit inclination adjustable by knurled screw with index moving over degree scale divided -8 (?) - 0 - 3 degrees, subdivided to 10’ and by vernier to 20”. Slit height adjustable by 2 sliding brass stops, and by two internal sliding stops moved by knurled screw behind. Hinged screw-on cover at back. Cast mount has 5 bolt holes and one steel locating rod.

References

Events