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harpoon cannon
A harpoon cannon is a whaling implement developed in the late 19th century and most used in the 20th century. It would be mounted on the bow of a whale catcher, where it could be easily aimed with a wide field of view at the target. Powered by black powder and later, smokeless powder, it would generally fire a large steel harpoon, either solid steel (cold harpoon) or fitted with an exploding black powder, or later, penthrite (PETN) grenade.
Harpoon cannons are still used today in whaling nations, but usually guns of a smaller caliber with the exception of Iceland, which hunts large whales regularly.
==History==
Early engineers attempted to develop gun-fired harpoons to improve the hit rate from hand-thrown harpoons, generally with little success, as the guns were not very accurate, especially when fired from small moving whaleboats. Another problem appeared when the quarry were baleen whales, which tended to sink when killed. The idea was modernized and perfected by Norwegian Svend Foyn. He developed a swiveling steel cannon, mounted to the bow deck of his steel and steam whaling ship, improving accuracy, and lastly, attaching an exploding steel head to the harpoon, filled with 500g of black powder. While by no means instantaneous, the whale's death would be faster than before, and there would be greater ease in keeping the whale attached to the harpoon line. Modern guns with improved grenades were significantly improved during the 20th century, and currently, the most advanced technologies can kill a whale virtually instantly.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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