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The BL 8-inch howitzer Mark I through to Mark V (1 to 5)〔I.e. models 1 through 5. Britain used Roman numerals to designate "Marks" or versions of guns until after World War II. Hence this article describes the first five models of British BL howitzer.〕 were a British improvisation developed early in the First World War to provide heavy artillery. It used shortened and bored-out barrels from various redundant naval 6-inch guns. It bore no relation to the later 8-inch howitzer of the First World War, the Vickers 8-inch Mark VI to VIII howitzers which succeeded it. ==History== The weapon entered service in February 1915. The Mark I–V had many relatively minor differences in the carriages and trails and Mk IV, Mk VI and QF Mk II 6-inch naval gun barrels were used.〔Mk I used barrels from BLC guns Mk I/IV; Mk II & III used barrels from BL Mk IV or VI; Mk IV used BLC Mk I/VI adapted for Mk IV carriage; Mk V used QF Mk II barrels converted to BL (total of 63). Details from Clarke 2005, page 34, and Tony DiGiulian's website (Britain 6"/40 (15.2 cm) QF Marks I, II and III )〕 However, the ballistic characteristics, propellant charges and shells used were similar for all Mks I–V. They are easily identified by their short thick barrel and twin recoil buffers above the barrel. Mks I–IV were no longer repaired from summer 1917 onwards.〔National Archives MUN5/373/9227〕 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「BL 8-inch howitzer Mk I–V」の詳細全文を読む スポンサード リンク
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