Browsing by Author "Eldridge, W"
Now showing items 1-1 of 1
-
Temporary mounting of an achromatic refracting telescope
Eldridge, W (Printed by Engelmann & Co., 1831)Engraving by W. Eldridge, of the temporary mounting of an achromatic refracting telescope belonging to Edward Joshua Cooper (1798-1863), it had a 14-inch object glass and a focal length of 25 feet.