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maybe on topic
Hi all, I have become interested in the history of visual observing. Lately I have been re-reading E. S. Holden's monologue on the central region of M-42.
I have 2 questions (1) from what I have read and the sketches I have studied our 8" LB gives comparable views to what they were seeing back then? (2) on Feb. 11, 1806 Sir W. Herschel talks of using a 'double eyepiece' in a 10 foot reflector. Any ideas on what a 'double eyepiece' might be?
Brian
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