CARVEL-BUILT. A vessel or boat, the planks of which are all flush and smooth, the edges laid close to each other, and caulked to make them water-tight: in contradistinction to clinker-built, where they overlap each other. CARY. _See_ MOTHER CARY'S CHICKEN. _Procellaria pelagica_. CASCABLE. That generally convex part of a gun which terminates the breech end of it. The term includes the usual button which is connected to it by the neck of the cascable. CASCADE. A fall of water from a considerable height, rather by successive stages than in a single mass, as with a cataract. CASCO. A rubbish-lighter of the Philippine Islands. CASE. The outside planking of the ship. CASE-BOOK. A register or journal in which the surgeon records the cases of all the sick and wounded, who are placed under medical treatment. CASEMATE. In fortification, a chamber having a vaulted roof capable of resisting vertical fire, and affording embrasures or loop-holes to contribute to the defence of the place: without these it would be merely a bomb-proof. CASERNES. Often considered as synonymous with _barracks_; but more correctly small lodgments erected between the ramparts and houses of a fortified town, to ease the inhabitants by quartering soldiers there, who are also in better condition for duty than if living in various parts. CASE-SHOT, COMMON. Called also canister-shot. Adapted for close quarters if the enemy be uncovered. It consists of a number of small iron balls, varying in weight and number, packed in a cylindrical tin case fitting the bore of the gun from which it is to be fired. Burrel, langrage, and other irregular substitutes, may be included under the term. Spherical case-shot are officially called _shrapnel shell_ (which see). CASHIERED. Sentenced by a court-martial to be dismissed the service. By such sentence an officer is rendered ever after incapable of serving the sovereign in any position, naval or military. CASING. The lining, veneering, or planking over a ship's timbers, especially for the cabin-beams; the sheathing of her. Also a bulk-head round a mast to prevent the interference of cargo, or shifting materials. CASING-COVER. In the marine steam-engine is a steam-tight opening for the slide-valve rod to pass through. CASK. A barrel for fluid or solid provisions. (_See_ STOWAGE.) CASKETS (properly GASKETS). Small ropes made of sinnet, and fastened to grummets or little rings upon the yards. Their use is to make the sail fast to the yard when it is to be furled. CASSAVA, OR CASSADA. A species of the genus _Jatropha janipha_, well known to seamen as the cassava bread of the West Indies. Tapioca is produced from the _Jatropha manihot_. Caution is necessary in the use of these roots, as the juice is poisonous. The root used as chewsticks, to cleanse the teeth and gums, by the negroes, produces a copious flow of frothy saliva.