Thanks for sharing, that's one of the best videos on B.I. The same iron and bronze naval gun carriage shown at 41 sec. into the video is now in my collection, serving as the carriage for "Vickie," the British 16-pounder rifled gun. Some may recall when I posted photos after I won it in a 2011 (?) auction of cannons and artillery accouterments from Eastover Resort in MA. The resort had purchased some of the very last artillery remaining on B.I., back in the 1950's. The carriage shown was made by the Navy in the 1870's for the short-lived "heavy 20 pdr. bronze rifle."