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1485 in M. Oppenheim Naval Accts. & Inventories Henry VII (1896) 38 Gonne chambres iiij ix.

1867 W. H. Smyth & E. Belcher Sailor's Word-bk. Gun-chambers. In early artillery a movable chamber with a handle like a paterero, used in loading at the breech. In more recent times the name has been used for the small portable mortars for firing salutes in the parks.