https://www.arithmeum.uni-bonn.de/en/collection/calculating-in-olden-times/object.html?tx_arithinventory%5Bobject%5D=8029&L=2
Dacometer 508
https://www.arithmeum.uni-bonn.de/en/collection/calculating-in-olden-times/object.html?tx_arithinventory%5Bobject%5D=1386&L=2
Dacometer 98
https://www.arithmeum.uni-bonn.de/en/collection/calculating-in-olden-times/object.html?tx_arithinventory%5Bobject%5D=2723&L=2
Torpedo 3 (Dacometer 508)
torpedo