Early non-achromatic telescope
- Made:
- France
- maker:
- John Marshall
Early non-achromatic telescope, 3-draw, dated 1739, French, length closed with caps 12 3/ 8" diam about 1 3/4", object glass 1" diam, focal length 28"
Early non-achromatic telescope, 3-draw, dated 1739, French, length closed with caps 12 3/ 8" diam about 1 3/4", object glass 1" diam, focal length 28"
