我的杂货库

 https://mls.kuu.la/share/collection/7lFlw?fs=1&vr=1&zoom=1&initload=0&autorotate=0.08&thumbs=1

  https://core.ac.uk/download/pdf/147123065.pdf MAH 2 This Portuguese reinforced demi-culverin9 (fig. 16) bears the Arms of Portugal above the armillary sphere on the third reinforce (fig. 17), and a three-leaf pattern around its sunken touchhole, which was likely a symbol of the founder. It is reinforced with simple astragal bands, and has a set of four lifting rings on the reinforces, and one lifting ring at the cascabel. Unlike any of the other guns in this collection, on the muzzle side of the trunnions, there is a place on the gun where the diameter changes abruptly; what I call a step-down band (fig. 18). Several flaws are apparent upon inspection of MAH 2. There are depressions in the muzzle, evidence of the use of insufficient metal in casting. Other flaws include cracks under the first set of reinforcement rings, and cracks and holes behind the muzzle set of lifting loops. The fact that these cracks exist under the rings makes it likely that they occurred when the model...