
Terrestrial telescope by J. Hurt non-achromatic (slide missing)

Terrestrial telescope by J. Hurt non-achromatic (slide missing), 4-draw, o.g.1 nch diameter, effective aperture 0.8 inch, focal length 2'3"
Terrestrial telescope by J. Hurt non-achromatic (slide missing), 4-draw, o.g.1 nch diameter, effective aperture 0.8 inch, focal length 2'3"