2-378-654 - Historica Graphica Collection/Heritage Images

Money making; stamping and milling the disks and weighing the finished coins, 20th century. When the disks have been cut they are 'marked' (top left), that is, the edge is slightly raised to protect the coin from abrasion, then washed in acid, cleaned in sawdust and dried by hot air. The disks are next stamped (top right). Finally the coins are weighed (bottom) in a room full of balances that are inspected daily. The coins fall automatically into one of three slots; heavy, light or correct.