protected cruiser
Sign in to savetype of naval cruiser of the late 19th century, so known because its armoured deck offered protection for vital machine spaces from fragments caused by exploding shells above
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Encyclopedic overview
The Russian protected cruiser Oleg was a Bogatyr-class protected cruiser
Protected cruisers, a type of cruiser of the late 19th century, took their name from the armored deck, which protected vital machine-spaces from fragments released by explosive shells. Protected cruisers lacked a belt of armour along the sides, in contrast to armored cruisers which carried both deck and belt armour.
Excerpted from Wikipedia’s “protected cruiser” article, available under the CC BY-SA 4.0 licence.