HERSCHEL, Sir William (1738-1822). Autograph manuscript note, together with autograph note by his sister, Caroline, both endorsed by J.F.W. Herschel, 1 page, oblong octavo; with: Sir John Frederich William HERSCHEL (1792-1871), two autograph letters signed (Feldhausen, 1837 and [n.d.], together 4 pages, 8vo, one concerning his 're-discovery... of one of the two newer satellites of Saturn discovered by my father', the other accepting an engagement, which he is able to do 'without infringing on the astronomical principle' of avoiding leaving home 'for a week before or after the new moon'... due to his 'stargazing pursuits'; with related material including Faraday's signature. All laid down or fastened at corners on one sheet.