Fig. 10From: A copper alloy light cannon from Grodno: an example of early firearms from Eastern EuropeCannon from the Old Castle in Grodno, Sample 1—results of metallographic examinations. a general view of the sample with zones of detailed observations (1–4). b, c microstructure in Zone 1, pores of various size and shape. d, e microstructure in Zone 2, CuS inclusions (light blue) in the Cu–Pb matrix. f microstructure in Zone 3, numerous poresBack to article page