we had a canon display at the club and this is frame from a video clip...as is the case with selecting a single frame the quality is not all that good, but it gives an idea of what it was like....bloody noisy...and very spectactular!!!
cannon barrel is about 700mm long and bore is 33mm
Attachment 365764
Attachment 365765
is it any wonder we have a shortage of blackpowder in Adelaide...this thing uses 640grains of bp and had 1lb lead ball in it