Accession No

0643

Brief Description

reflecting telescope, Gregorian, circa 1740

Origin

Maker

Class

astronomy; optical

Earliest Date

1740

Latest Date

1740

Inscription Date

Material

hide (leather); metal (brass, speculum metal, steel); glass; wood (oak)

Dimensions

box length 446mm; breadth 165mm; height 106mm

Special Collection

Robert Whipple collection

Provenance

Purchased by Robert Stewart Whipple from T.H. Court on 05/11/1930. G. Green repaired the leather and fitted a new screw in 12/1930.

Inscription

‘399’ (scratched inside primary mirror cell)

Description Notes

Gregorian reflecting telescope. Black leather covered brass barrel with friction-tight cover. Screw-in eye-end with screw-in eyepiece. Eyepiece had screw-on pinhole. Eyepiece lenses in threaded brass mounts. Speculum metal primary mirror held by 3 blued steel springs. Focus by long screw from eye-end moving speculum metal secondary mirror. Barrel secured by 2 wing nuts to ball and socket joint on pillar stand screwed into brass mount on fitted oak box.

References

Events