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Diadem-class cruiser
The ''Diadem''-class cruiser was a class of "first class" protected cruiser built for the Royal Navy during the 1890s that served in the First World War. The class consisted of eight ships, built at a cost of around £600,000 each.
They were considered "good sea boats" but criticised for their lack of a heavy calibre main armament, bulky unprotected sides, average speed and lack of manoeuvrability despite being considered large ships when completed. They were the last British first class protected cruisers; the armoured cruiser taking the large cruiser role in future."〔(Diadem class at worldwar1.co.uk )〕
== Design ==
The ''Diadem''s were designed by Sir William White, and are typical of British design practice of the period, with high freeboard (by the standards of the time) and the use of 'double-decker' casemates, with the hull forward and aft cut away to allow fore and aft fire from the casemate guns. Casemates provided protection for the guns and allowed a large number of guns to bear on the broadside; however, the lower (main deck) guns were almost unusable in heavy seas.〔Brown, p.136〕
According to a contemporary (1900) edition of Jane's Fighting Ships the hulls were wood sheathed and coppered.〔Jane's Fighting Ships 1900, p.108〕 and "There are coal bunkers on the lower deck, and above and below the armour deck. The pair of 6 in guns forward and aft are served by one hoist to the pair, each casemate has its own hoist: those to the double casemates being double. The machinery weighs 1630 tons: the boilers occupy a space of about 132 feet (40 m). Working pressure is (to 250 psi (2.1 to 1.7 MPa) ).〔 "The ships are almost absolutely identical in appearance. The ''Diadem'' and ''Andromeda'' have no steam pipes abaft the first two funnels, while all the others have steam pipes before and abaft each funnel."〔
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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