One of twenty six reflecting telescope eyepieces, in wooden mounts

One of twenty six eyepieces, in wooden mounts made by William Herschel and used with his own reflecting telescopes, Slough, England, 1780-1800. Inscribed D21.

Details

Category:
Astronomy
Object Number:
1925-467/21
Materials:
glass, wood (unidentified) and paper (fibre product)
Measurements:
overall: 24 mm x 20 mm diameter, <0.01 kg
type:
components, eyepieces and astronomical instruments
credit:
Mr John Herschel-Shorland