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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Polymer-cased ammunition ： ウィキペディア英語版 Polymer-cased ammunition Polymer-cased ammunition (or PCA) is ammunition with polymer-based casings instead of the usual metal-based casing. PCA is considered an alternative to reduce cost and weight in ammunition for guns and handguns. ==Origin== The first references to the possible use of polymers in the manufacture of casings come from the early 1950s. One of the earliest is the patent filled by Jack W. Roske in 1950〔(【引用サイトリンク】url=http://www.google.com/patents/US2654319 )〕 and the idea was to use a metal cup joined with a polymer shell ''"that will be converted to gas during the firing phase to assist in propelling the projectile and thereby permit reduction in the use of the propelling powder charge".'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polymer-cased ammunition」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.