Thomas Phelps and John Bartlett making astronomical observations in the observatory of the Earl of Macclesfield, Oxfordshire. Me

Mezzotint of Thomas Phelps (left) and John Bartlett..Phelps and Bartlett are shown in the Shirburn observatory's transit room, with Phelps observing through the 5-foot transit telescope, by Jonathan Sisson, fixed to supporting pillars. He is steadying himself by leaning on the back of an observing chair. Behind Bartlett is an astronomical regulator, an accurate observatory clock, by George Graham. To the left is an equatorially-mounted, unfixed telescope, probably by Dollond,