Donati's Comet, 2 October 1858 Size:XS: 30 x 20cm Map 4 from John Flamsteed's

Map 4 from John Flamsteed's Atlas Coelestis

McMahon as Mercury pours a chamber pot over his flaming head

Polyorama Panoptique

William Bayly was employed as an assistant by Nevil Maskelyne at the Royal Observatory

Donati's Comet, 2 October 1858 Size:XS: 30 x 20cm Map 4 from John Flamsteed'sAstronomical study of the head of Donati's Comet observed through the 15 inch refracting telescope at the observatory of Harvard College. Donati's Comet was one of the brightest to be seen in the 19th century and was the first to be photographed (by G. P. Bond and others). It was discovered by the Italian astronomer Giovanni Battista Donati (1826 1873). Plate 1 from the monograph An account of Donati's Comet of 1858, by George P. Bond (Cambridge,