11-13-2013, 08:18 AM
The espringal was a Roman ballista in reverse. It had a large square frame with the skeins on the ouside with two bow arms projecting inwards towards the bed of the machine and the bolt channel. An 11th century Byzantine diagram of this machine is in existence.
Martin
Fac me cocleario vomere!
Fac me cocleario vomere!