1. Discoverers of the Universe
2. “Account of telescopes”, undated but before the casting of new mirrors for the 20-ft by William and John in June 1817 (see below). Transcribed in Dreyer J. L. E. (ed.), The scientific papers of Sir William Herschel (2 vols, London, 1912; hereafter: Papers), i, p. lv: “I cannot recommend the 40 feet to be kept up.”
3. For the final polishing, see Herschel JohnMrs, Memoir and correspondence of Caroline Herschel, 2nd edn (London, 1879; hereafter: Memoir), 124. For the final observation, see RAS W.2/2.8, where there is no doubt that the year in question is 1814. Unfortunately in later writing up the observation for the Saturn file, Caroline erroneously wrote “August 1815”, RAS W.3/1.9, and this misled Dreyer (Papers, i, p. liii).