Drawing, unidentified nebula ["Nova"], by Sir John Frederick William Herschel Plate 10 figure 30 for the paper "Observations of nebulae and clusters of stars, made at Slough, with a twenty-feet reflector, between the years 1825 and 1833", by Sir John Frederick William Herschel, Philosophical Transactions of the Royal Society, v.123 (1833), pp.359-505. The object is inscribed verso ""Nova". Herschel's paper explains this term: "When no previous version of a nebular or cluster could be found in the writings of former observers, it is designated as Nova".Shown with a scale of 0-2 minutes, not used on the plate. With an instruction to the printer verso: "Nb The divided scale not to remain being doubtful". Also inscribed verso, in pencil with right ascension, North polar distance and sweep numbers. 1833