Eyepiece in brass mount inscribed "63" and "320" focal length 0.825 - in 1 3/16 long 7/8 long

Eyepiece in brass mount inscribed "63" and "320" focal length 0.825 - in 1 3/16 long 7/8 long, 7/8 in diameter

Details

Category:
Astronomy
Object Number:
1925-466
Materials:
glass and brass
type:
components, eyepieces and astronomical instruments
credit:
Mr John Herschel-Shorland