 Jacob Lehmann must have been highly strict with his pupils, and more often than not, school inspections yielded complaints about mishandling children, for which Lehmann once had to pay a fine of 7 Rhenish guilders and 28 Kreuzer.In 1870, Lehmann sought to have himself pensioned off because of a rheumatic complaint in his right leg.At first, all he got was an assistant, whom he was expected to pay out of his own pocket, since he was rather well off and could afford it.