 The junior Aaron left the family firm in 1832, and upon the death of Samuel in 1839, John merged it into his own successful business.In 1863 he received the gold medal of the Royal Geographical Society, which was what the Geographical Society of London was known after gaining the patronage of King William IV.Arrowsmith spent the years after his uncle's death preparing maps for his iconic "London Atlas of Universal Geography", the first edition of which was published in 1834 with 50 maps.