GUNNERY REFRESHER COURSE FOR SMALL VESSELS GUN CREWS. 5 JULY 1944, HARWICH. - This mounting gives the effect of a rolling ship, a model ship is mounted in the cage on top of the gun barrel and an airgun on the top of the Breech end of the gun fires slugs at the model. This gives the same result as firing a full charge. The instructor is at the forward end of the gun. ,

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