George Scharf, who was German-born and migrated to London in 1816, was an artist who worked primarily as a lithographer for the Geological Society and other scientific institutions.   He was also responsible for over a thousand sketches, drawings and watercolours, now in the British Museum, that documented a rapidly changing London between the 1820s and 40s.  Scharf's interests are idiosyncratic, particular and local -- the backyard of his home in Francis Street off the Tottenham Court Road, for example, the laying of pipes for gas lighting and mains water, or pavements in the rain.   He also depicts the metropolis's street hawkers, performers, signboard carriers, and delivery workers as well people on the move, engaged in their own unknowable business.  In this paper I discuss one drawing, from 1841, entitled 'Dinner Time, Sunday, One O'Clock' which shows men, women, and children getting take-away food as many lower class dwellings did not have kitchens.   The drawing features a well-known type in late Georgian-early Victorian society, the pot-boy, who delivered beer in tankards, carried in numbers in a rack.  Scharf's drawing shows the 'boy', who is clearly a child, carrying his rack in one hand with his delivery list in the other.  The pot-boy was a ubiquitous figure in early nineteenth century, comparable with others who were part of a communications infrastructure -- the newsman who delivered newspapers and the bill-sticker who posted notices on walls (both of whom are also depicted by Scharf).  I compare Scharf's drawing with John Keats's view from his sick-room in Hampstead on a Sunday on February 8 1820 where he 'descried' a 'Pot Boy' and 'conjectured' that it was the 'one o'clock beer' and ask what does it mean to 'conjecture' time and sociality from such busy passers-by.