1 0 0 0 OA 物理学通論

著者
本多光太郎 著
出版者
内田老鶴圃
巻号頁・発行日
1941

1 0 0 0 OA 新撰物理学

著者
本多光太郎, 田中三四郎 著
出版者
内田老鶴圃
巻号頁・発行日
1901
著者
本多光太郎 著
出版者
内田老鶴圃
巻号頁・発行日
vol.第1巻, 1920
著者
本多 光太郎 竹前 源藏 渡邊 直行
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.17, no.10, pp.1047-1057, 1931-10-25

The purpose of the present investigation was to measure quantitatively the efficiency of a shield plate in resisting penetration by a rifle bullet. A simple, mechanical, and accurate method for determining the velocity of the bullet was devised, by which the velocity of the bullet after passing through test plates of different thickness was measured. By this means the residual velocity vers. plate thickness curve for different metals was obtained. This curve which is called the "characteristic curve" of the shielding efficiency of a metal was obtained for different metals and alloys. The curve not only dives the residual velocity of a bullet after passing throgh a shield plate of a given thickness, but also the thickness of the metal plate which is just sufficient to stop the impinging bullet, on the "penetration distance". The best material found as the result of the present investigation is a special steel, the penetration distance of which is 4.5mm. for a bullet 9 grams in mass and a velocity 790 meters per second. The penetration distance of laminated plates, and of two plates of equal thickness separated from each other by a distance was also measured. The same quantity for wood, sand and glass, of different kinds was also measured.