出版社：Nauchnyi Izdatel'skii Dom Issledovatel',Academic Publishing House Researcher
摘要：In the article it is told about two cases of the loss of sail battleships because of the filling by their water through the cannon ports. It is proven that the invention of gun port was powerful stimulus for an increase in the firepower of ship, determined at that time by the number of instru-ments, but for the power it was necessary to pay by safety.
