A wooden model of a trebuchet, with its tall frame, long arm, counterweight box and the long trough guiding the sling, rests on a plinth beside its label. According to the label, it fired one or two shots an hour, throwing stone balls of up to 100 kg as far as 200 metres, and needed a crew of 30 to 200 men; at the siege of Caffa in Crimea in 1346 it was used to hurl plague-ridden corpses into the town.