Rudolph Ackermann ( 1764 - 1834 ) was a British painter. Rudolph Ackermann s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 60 USD for British Anti-Napoleon Caricatures] Seven Plates in 2004 to 2191.66 USD for Microcosm of London in 2006 , based on the size and medium of the artwork.