Istilah - Istilah Dalam Perkapalan (Abjad A & B)

Salam sobat blogger, kali ini akan saya coba untuk meng-kliping sebuah istilah – istilah dalam dunia perkapalan, semoga ini bisa bermanfaat buat semua, terutama bagi teman – teman yang baru saja atau yang ingin mengenal dan belajar dunia perkapalan. Hanya saja kali ini akan saya coba sampaikan dari abjad A & B saja, untuk abjad selanjutnya akan segera menyusuuul.

----A----

ABAFT

Toward the stern of a ship; back; behind; back of; further aft than.

ABEAM

At right angles to the keel.

ABOARD

On or in a ship.

ABREAST

Side by side; over against; opposite to.

ACCOMMODATION LADDER

Stairs slung at the gangway, leading down the vessel's side to a point near the water, for ship access from small boats.

AFT

Near the stern; toward the stern.

AFTER BODY

That portion of a ship's body aft of the midship section.

AFTER FRAMES

Frames aft of amidships, or frames near the stern of the ship.

AFTER PEAK

The aftermost tank or compartment forward of the stern post.

AFTER PERPENDICULAR

A line perpendicular to the base line intersecting the after edge of the stern post at the designed water line. On submarines or ships having a similar stern, it is a vertical line passing through the point where the designed water line intersects the stern of the ship.

AIR CASING

A ring-shaped plate coaming surrounding the stack and fitted at the deck just below the umbrella, to protect the deck from heat and to help ventilate the fireroom.

AIRCRAFT CARRIER

A vessel designed to carry aircraft and fitted with a flying deck from which aircraft are launched and on which they land. A floating flying field which usually operates as a unit of a fleet.

AIR PORT

An opening in the side or deck house of a vessel, usually round in shape and fitted with a hinged frame in which a thick glass is secured. The purpose of the air port is to provide light and ventilation to and vision from the interior of the ship. In some instances the air port is also provided with an additional solid metal hinged cover for purposes of protection of the interior should the glass be damaged or to prevent light from showing from within.

ALOFT

In the top or upper rigging; on the yards; above the decks.

AMIDSHIPS

In the vicinity of the middle portion of a vessel as distinguished from her ends. The term is used to convey the idea of general locality but not that of definite extent.

ANCHOR

A heavy iron or steel implement attached to a vessel by means of a rope or chain cable for holding it at rest in the water. When an anchor is lowered to the bottom, the drag on the cable causes one or more of  the prongs, called flukes, to sink into or engage the ground which provides holding power.

ANCHOR, BOWER

The large anchors carried in the bow of a vessel. Three are usually carried, two (the main bowers) in the hawse pipes, or on bill boards, and a third (spare) lashed on deck or elsewhere about the vessel for use in the event either of the main bowers is lost. The weight varies with the size and service of the ship.

ANCHOR, KEDGE

A small anchor used for warping or kedging. It is usually planted from a small boat, the vessel being hauled up toward it. The weight varies, being usually from 900 to 1,200 pounds.

ANCHOR, SEA

This is not a true anchor, as it does not sink to the bottom. It is a conical-shaped canvas bag required by the Steamboat Inspection Service to be carried in each lifeboat. When placed overboard it serves a double purpose in keeping the boat head-on into the sea and in spreading a vegetable or animal oil from a container

placed inside the bag. It is sometimes called an oil spreader.

ANCHOR, STREAM

An anchor weighing from about one-fourth to one-third the weight of the main bowers and used when mooring in a narrow channel or harbor to prevent the vessel's stern from swinging with the current or the tide.

ANGLE

Same as angle bar.

ANGLE BAR

A bar of angle-shaped section used as a stiffener and for attachment of one plate or shape to another.

ANGLE BULB

A structural shape having a bulb on one flange of the angle, used as a frame, beam, or stiffener.

ANGLE COLLAR

A collar or band made of one or more pieces of angle bar and fitted tightly around a pipe, trunk, frame, longitudinal, or stiffener intersecting or projecting through a bulkhead or deck for the purposes of making a watertight or oiltight joint. See Stapling.

ANNEAL

To heat a metal and to cool it in such a fashion as to toughen and soften it. Brass or copper is annealed by heating to a cherry red and dipping suddenly into water while hot. Iron or steel is slowly cooled from the heated condition to anneal.

APPENDAGES

Relatively small portions of a vessel extending beyond its main outline as shown by transverse and water plane sections, including such items as shafting, struts, bossings, docking and bilge keels, propellers, rudder, and any other feature, extraneous to the hull and generally immersed.

APRON

A reinforcing timber bolted to the after side of the stem.

ARBOR

The principal axis member, or spindle, of a machine by which a motion ofbrevolution is transmitted.

ARCHING

Sometimes used in lieu of "hogging".

AREA OF SECTIONS

The area of any cross section of the immersed portion of a vessel, the cross section being taken at right angles to the fore and aft centerline of the vessel.

ASTERN

Signifying position, in the rear of or abaft the stern; as regards motion, the opposite of going ahead; backwards.

ATHWART

Across, from side to side, transverse, across the line of a vessel's course.

ATHWARTSHIP

Reaching across a vessel, from side to side.

AUXILIARIES

Various winches, pumps, motors, engines, etc., required on a ship, as distinguished from main propulsive machinery (boilers and engines on a steam installation).

AWNING

A rooflike canopy of canvas suspended above a vessel's decks, bridges, etc., for protection against sun and weather.

--B--

BACK BAR

Used for the same purpose but on the opposite side to a bosom bar.

BACK BOARD

A portable back support nicely designed and fitted on the after side of the stern thwart in a small motor or row boat.

BACK STAY

Stays which extend from all mast levels, except the lower, to the ship's side at some distance abaft the mast. They serve as additional supports to prevent the masts going forward and also contribute to the lateral support, thereby assisting the shrouds.

BAFFLE

A plate or structure placed in the line of flow of fluids or gases to divert the flow in order to obtain greater contact with heating or cooling surfaces.

BALANCED RUDDER

A rudder with its axis between the forward and after edge.

BALK

A piece of timber from 4" to 10" square.

BALLAST

Any weight carried solely for the purpose of making the vessel more seaworthy. Ballast may be either portable or fixed, depending upon the condition of the ship. Fixed or permanent ballast in the form of sand, concrete, lead, scrap, or pig iron is usually fitted to overcome an inherent defect in stability or trim due to faulty design or changed character of service. Portable ballast, usually in the form of water pumped into or out of the bottom, peak, or wing ballast tanks, is utilized to overcome a temporary defect in stability or trim due to faulty loading, damage, etc., and to submerge submarines.

BALLAST TANKS

Tanks provided in various parts of a ship for introduction of water ballast when necessary to add weight to produce a change in trim or in stability of the ship, and for submerging submarines.

BALLAST WATER

Sea water, confined to double bottom tanks, peak tanks, and other designated compartments, for use in obtaining satisfactory draft, trim, or stability.

BALLASTED CONDITION

A condition of loading in which it becomes necessary to fill all or part of the ballast tanks in order to secure proper immersion, stability, and steering qualities brought about by consumption of fuel, stores, and water or lack of part or all of the designed cargo.

BALSA

A light wood; a South American raft made of light wood.

BARGE

A craft of full body and heavy construction designed for the carriage of cargo but having no machinery for self-propulsion.

BATTEN

Long, thin, strips of wood, steel, or plastic, usually of uniform rectangular section used in the drafting room and mold loft to lay down the lines of a vessel, but sometimes thinned down in the middle or at the ends to take sharp curves. A strip of wood or steel used in securing tarpaulins in place. To secure by means of battens, as to "batten down a hatch."

BATTENS, CARGO

A term applied to the wood planks or steel shapes that are fitted to the inside of the frames in a hold to keep the cargo away from the shell plating; the strips of wood or steel used to prevent shifting of cargo.

BATTENS, SEAM

Wood seamstraps which connect the edges of small boats having a single thickness of planking. They give additional stiffness to the plank, are continuous, and frames are notched out to fit over them.

BATTLE CRUISER

A naval vessel having high speed, wide radius of action, guns of large size and range, and moderate protection; often defined as a ship cruiser speed and battleship armament, with full protection against cruisers and smaller vessels and capable of operation in all weather.

BATTLESHIP

A naval vessel having a large displacement, good speed, large radius of action, maximum armament, maximum protection against gun fire, bombs, and torpedoes, ability to keep at sea in all weathers and to bear the brunt of sea fighting as a line-of-battle ship.

BEAM

The extreme width of a ship. Also an athwartship or longitudinal member of the ship's structure supporting the deck.

BEAM KNEE

A bracket between a frame or stiffener and the end of a beam; a beam arm.

BEAM LINE

A line showing the points of intersection between the top edge of the beam and the molded frame line, also called "molded deck line".

BEAM, TRANSOM

A strong deck beam situated in the after end of the vessel connected at each end to the transom frame. The cant beams which support the deck plating in the overhang of the stern are attached to and radiate from it.

BEAM, PLATE ANGLE

A beam made from a flat plate, with the flange bent at right angles as by an anglebending machine.

BEARDING LINE

A term applied to the intersection of the molded line of planking or plating and the stem, stern post, and keel, usually in connection with wood shipbuilding.

BEARER

A term applied to foundations, particularly those having vertical web plates as principal members. The vertical web plates of foundations are also called bearers.

BEARING

A block on or in which a journal rotates; a bearing-block.

BELL

In pipe fitting, the recessed or enlarged female end of a pipe into which the male end of the next pipe fits. In plumbing, the expanded female portion of a wiped joint.

BELL MOUTHED

A term used to signify the open end of vessel or pipe when it expands or spreads out with an increasing diameter, thus resembling a bell--also called trumpet mouthed.

BELOW

Underneath the surf the water. Underneath a deck or decks.

BENDING ROLLS

A large machine used to give curvature to plates by passage in contact with three rolls.

BENDING SLAB

Heavy cast-iron blocks with square or round holes for "dogging down," arranged to form a large solid floor on which frames and structural members are bent and formed.

BERTH

A term applied to a bed or a place to sleep. Berths, as a rule, are permanently built into the structure of the staterooms or compartments. They are constructed singly and also in tiers of two or three, one above the other. When single, drawers for stowing clothing are often built in underneath. Tiers of berths constructed of pipe are commonly installed in the crew space. Also, a place for a ship.

BETWEEN DECKS

The space between any two, not necessarily adjacent, decks. Frequently expressed as "Tween Decks."

BEVEL

A term for a plane having any other angle than 90 degrees to a given reference plane. Also, a small tool similarl to a try square except that the blade is adjustable to taking bevels.

BEVEL, CLOSED

A term applied where one flange of a bar is bent to form an acute angle with the other flange.

BEVEL, OPEN

A term applied where one flange of a bar is bent to form an obtuse angle with the other flange. Frame bars in the bow and the stern of a vessel are give an open bevel to permit access for riveting to shell and to keep the standing flange parallel to the deck beams.

BIBB

A cock or valve with a bent outlet; strictly, the bent outlet.

BIGHT

A loop or bend in a rope; strictly, any part between the two ends may be termed the bight.

BILGE

The rounded portion of a vessel's shell which connects the bottom with side. To open a vessel's lower body to the sea.

BILGE PLATES

The curved shell plates that fit the bilge.

BILGES

The lowest portion of a ship inside the hull, considering the inner bottom where fitted as the bottom hull limit.

BILL BOARD

An inclined platform, fitted at the intersection of the forward weather deck and the shell, for stowing an anchor. It may be fitted with a tripping device for dropping the anchor overboard. Seldom fitted since the stockless anchor has come

into general use.

BINNACLE

A stand or case for housing a compass so that it may be conveniently consulted. Binnacles differ in shape and size according to where used and the size of the compass to be accommodated. A binnacle for a ship's navigating compass consists essentially of a pedestal at whose upper end is a bowl-shaped receptacle having a sliding hoodlike cover. This receptacle accommodates the gimbals supporting the compass. Compensating binnacles are provided with brackets or arms on either side, starboard and port, for supporting and securing the iron cylinders or spheres used to counteract the quadrantal deviation due to the earth's magnetization of the vessel. This type of binnacle is usually placed immediately in front of the steering wheel, having its vertical axis in the vertical plane of the fore-and-aft centerline of the vessel.

BITTER END

The inboard end of a vessel's anchor chain which is made fast in the chain locker.

BITTS

A terms applied to short metal or wood columns extending up from a base plate secured to a deck or bulwark rail or placed on a pier and to timbers extended up through and a short distance above a deck for the purpose of securing and belaying ropes, hawsers, cables, etc. Also called bollards.

BITUMASTIC

A black tarlike composition largely of bitumen or asphalt and containing such other ingredients as rosin, portland cement, slaked lime, petroleum, etc. It is used as a protective coating in ballast and trimming tanks, chain lockers, shaft alleys, etc.

BLEEDER

A small cock, valve, or plug to drain off small quantities of fluids from a container or system.

BLIND PULLEY

A circular block of hard wood with rounded edges perforated by several holes having grooves running from them to one side of the block. One of these blocks is secured to an end of a part of the standing rigging, as a shroud, and another to the chain plate or to some part of the ship and the two are connected to one another

by a lashing passing through the holes. Commonly called "dead eyes".

BLINKER LIGHTS

Two electric lanterns secured at the ends of the signal yard and operated by controllers and a telegraph key for use in night signaling by code.

BLOCK

The name given to a pulley or sheave, or a system of pulleys or sheaves, mounted in a frame or shell and used for moving objects by means of ropes run over the pulleys or sheaves. The prefixes, single, double, triple, etc., indicate the number of pulleys or sheaves in the block. The five principal parts of a block are (a) the shell, or outside frame, (b) the sheave, on which the rope runs, (c) the pin, on which the sheave turns, (d) the strap, by which the hook is held in position and which provides bearing for the pin, and (e) the hook, which may be open, sister, or shackle and fixed or swivel. The opening between the top of the sheave and the shell is called the swallow, that between the bottom of the sheave and the shell is called the breech, and the device attached to the bottom of the block opposite the hook for securing the standing part of the fall to the block is called the becket.

BLOCK, CHEEK

A half shell block with a single sheave bolted to a mast or other object which serves as the other half shell or cheek. Usually used in connection with halyards.

BLOCK, FIDDLE

A block having two sheaves of different diameters placed in the same plane one above the other.

BLOCK, SNATCH

A single sheave block having one side of the frame hinged so that it can be opened to allow the bight of a rope to be placed on the sheave, thus avoiding the necessity of threading the end of the rope through the swallow of the block. Usually employed as a fair lead around obstructions.

BLOWER

A mechanical device used to supply air under low pressure for artificial ventilation and forced draft, usually of the centrifugal type.

BOARDING

The act of going on board a ship.

BOBSTAYS

The chains or ropes attached underneath the outer end of the bowsprit and led aft to the stem to prevent the bowsprit from jumping up. Where two are fitted they are called the inner and the cap bobstays; when three are fitted they are called the inner, the middle, and the cap bobstays.

BODY PLAN

A plan consisting of two half transverse elevations or end views of a ship, both having a common vertical center line, so that the right-hand side represents the ship as seen from ahead, and the left-hand side as seen from astern. On the body plan appear the forms of the various cross sections, the curvature of the deck lines

at the side, and the projections, as straight lines of the water lines, the bow and buttock lines, and the diagonal lines.

BOILER

Any vessel, container, or receptacle that is capable of generating steam by the internal or external application of heat. The two general classes are fire tube and water tube.

BOILER CASING

Walls forming a trunk leading from the boiler room to the boiler hatch, which protect the different deck spaces from the heat of the boiler room, etc.

BOILER ROOM

A compartment in the hold, in the middle or after section of a vessel, where the boilers are placed.

BOLLARDS

See "bits".

BOLSTER PLATE

A piece of plate adjoining the hawse hole, to prevent the chafing of the hawser against the cheek of a ship's bow. A plate for support like a pillow or cushion. A piece of timber used as a support. A temporary foundation.

BOLT

A metal rod used as a fastening. With few exceptions, such as drift bolts, a head or shoulder is made on one end and a screw thread to carry a nut is cut on the other.

BOLTING UP

Securing by means of bolts and nuts parts of a structure in proper position for permanent attachment by riveting or welding. A workman employed on this work is called a "bolter-up".

BONJEAN CURVES

Curves of areas of transverse sections of a ship. The curves of the moments of these areas above the base line are sometimes included.

BONNET

A cover used to guide and enclose the tail end of a valve spindle.

BOOBY HATCH

An access hatch from a weather deck protected by a hood from sea and weather. The hood is often fitted with a sliding cover to facilitate access.

BOOM

A term applied to a spar used in handling cargo, or to which the lower edge of a fore-and-aft sail is attached.

BOOM TABLE

An outrigger attached to a mast or a structure built up around a mast from the deck to support the heel bearings of booms and to provide proper working clearances when a number of booms are installed on or around one mast.

BOOT TOPPING

An outside area on a vessel's hull from bow to stern between certain waterlines to which special air, water, and grease-resisting paint is applied; also the paint applied to such areas.

BORING BAR

A portable, heavy duty tool, used for boring, counter boring, reboring, facing, grooving, etc., where true alignment is of primary importance.

BOSOM

The inside of an angle bar.

BOSOM BAR

An angle fitted inside another.

BOSOM PLATE

A plate bar or angle fitted in the bosoms of two angle bars to connect the ends of the two angles as if by a butt strap.

BOSS

The curved, swelling portion of the ship's underwater hull around the propeller shaft.

BOSS PLATE

The plate that covers the boss.

BOTTOM

That portion of a vessel's shell between the keel and the lower turn of the bilge.

BOTTOM, OUTER

A term applied to the bottom shell plating in a double bottom ship.

BOTTOM PLATING

That part of the shell plating which is below the water line. More specifically, the immersed shell plating from bilge to bilge.

BOW

The forward end of the ship. The sides of the vessel at and for some distance abaft the stem, designated as the right-hand, or starboard bow, and the left-hand, or port bow.

BOW LINES

Curves representing vertical sections parallel to the central longitudinal vertical plane of the bow end of a ship. Similar curves in the aft part of a hull are called buttock lines. Also, a rope leading from the vessel's bow to another vessel or to a wharf for the purpose of hauling her ahead or for securing her.

BOWSPRIT

A spar projecting forward over the bow for the purpose of holding the lower ends of the head sails.

BRACE

A rope attached to the yard arm, used to alter the position of the yard arm in a horizontal plane. The operation is known as trimming the sail.

BRACKET

A steel plate, commonly of triangular shape with a reinforcing flange on its free edge, used to connect two parts such as deck beam to frame, frame to margin plate, etc.; also used to stiffen or tie beam angles to bulkheads, frames to longitudinals, etc.

BRAILS

Ropes rove through blocks fastened to a spar and attached to the leech of sail. The overhauling of these ropes gathers the sail up against the spar.

BRAZING

The joining of certain metals by the use of a hard solder.

BREADTH, EXTREME

The maximum breadth measured over plating or planking, including beading or fenders.

BREADTH, MOLDED

The greatest breadth of the vessel measured from heel of frame on one side to heel of frame on other side.

BREADTH, REGISTERED

Measured amidships at its greatest breadth to outside of plating.

BREAK OF FORECASTLE or POOP

The point at which the partial decks known as the forecastle and poop are discontinued.

BREAKWATER

A term applied to plates or timbers fitted on a forward weather deck to form a Vshaped shield against water that is shipped over the bow.

BREAST HOOK

A triangular-shaped plate fitted parallel to and between decks or side stringers in the bow for the purpose of rigidly fastening together the peak frames, stem, and outside plating; also used, in conjunction with the above duties, to fasten the ends of side stringers firmly together.

BRIDGE

A high transverse platform, often forming the top of a bridge house, extending from side to side of the ship, and from which a good view of the weather deckmay be had. An enclosed spaced called the pilot house is erected on the bridge in which are installed the navigating instruments, such as the compass and binnacle, the control for the steering apparatus, and the signals to the engine room. While the pilot house is generally extended to include a chartroom and sometimes staterooms, a clear passageway should be left around it. As the operation of the ship is directed from the bridge or flying bridge above it, there should also be a clear, open passage from one side of the vessel to the other. The term is also applied to the narrow walkways, called connecting bridges, which connect the bridge deck with the poop and forecastle decks. This type of bridge is usually found on tankers and is desirable whenever bulwarks are not fitted.

BRIDGE HOUSE

A term applied to an erection or superstructure fitted about amidship on the upper deck of a ship.

BRIDGE, NAVIGATING, or FLYING

The uppermost platform erected at the level of the top of the pilot house. It generally consists of a narrow walkway supported by stanchions, running from one side of the ship to the other and the space over the top of the pilot house. A duplicate set of navigating instruments and controls for the steering gear and engine room signals are installed on the flying bridge so that the ship may be navigated in good weather from this platform. Awnings erected on stanchions and weather cloths fitted to the railing give protection against sun and wind.

BROKEN BACKED

Said of a vessel when, owing to insufficient longitudinal strength, grounding, or other accident, her sheer is reduced or lost, thereby producing a drooping effect at both ends.

BROW

A gangplank, usually fitted with rollers at the end resting on the wharf to allow for the movement of the vessel with the tide. See watershed.

BUCKLE

A distortion, such as a bulge; to become distorted; to bend out of its own plane.

BUCKLER

Generally, but not exclusively, applied to various devices used to prevent water from entering turret gun ports, hawse and chain pipes, etc.

BUCKLING

The departure of a plate, shape, or stanchion from its designed plane or axis when subjected to load or to strains introduced during fabrication, thereby reducing its ability to carry loads.

BUILDING SLIP

An inclined launching berth where the ship is built.

BULKHEAD

A term applied to any one of the partition walls which subdivide the interior of a ship into compartments or rooms. The various types of bulkheads are distinguished by the addition of a word or words, explaining the location, use, kind of material or method of fabrication, such as fore peak, longitudinal, transverse, watertight, wire mesh, pilaster, etc. Bulkheads which contribute to the strength and seaworthiness of a vessel are called strength bulkheads, those which are essential to the watertight subdivision are watertight or oiltight bulkheads, and gastight and fumetight bulkheads serve to prevent gas or fumes from leaving or entering certain parts of a vessel.

BULKHEAD, AFTER PEAK

A term applied to the first transverse bulkhead forward of the stern post. This bulkhead forms the forward boundary of the after-peak tank and should be made watertight.

BULKHEAD, COLLISION

The foremost transverse watertight bulkhead in a ship which extends from the bottom of the hold to the freeboard deck. It is designed to keep water out of the forward hold in case of collision damage. Usually, this is the fore peak bulkhead at the after end of the fore peak tank.

BULKHEAD, JOINER

Wood or light metal bulkhead serving to bound staterooms, offices, etc. and not contributing to the ship's strength. Included under this head are corrugated metal, pressed panel, pilaster, aluminum, stainless steel, etc.

BULKHEAD STIFFENER

Members attached to the plating of a bulkhead for the purpose of holding it in a plane when pressure is applied to one side. The stiffener is generally vertical, but horizontal stiffeners are used and both are found on same bulkheads. The most efficient stiffener is a T section; flat bars, angles, channels, zees, H and I sections

are commonly used.

BULKHEAD, SWASH

A strongly built, nontight bulkhead placed in oil or water tanks to slow down the motion of the fluid set up by the motion of the ship.

BULKHEAD, WIRE MESH

A partition or enclosure bulkhead, used largely in store rooms, shops, etc., made of wire mesh panels.

BULLDOZER

A machine, usually hydraulic or electric, for bending bars, shapes or plates while cold.

BULWARK

A term applied to the strake of shell plating or the side planking above a weather deck. It helps to keep the deck dry and also serves as a guard against losing deck cargo or men overboard. Where bulwarks are fitted, it is customary to provide openings in them which are called freeing ports, to allow the water that breaks

over to clear itself.

BULWARK STAY

A brace extending from the deck to a point near the top of the bulwark, to keep it rigid.

BUMPED

A term applied to a plate which has been pressed or otherwise formed to a concave or convex shape. Used for heads of tanks, boilers, etc.

BUNK

A built-in berth or bed.

BUNKER

A compartment used for stowage of coal or oil fuel.

BUOYANCY

Ability to float; the supporting effort exerted by a liquid (usually water) upon the surface of a body, wholly or partially immersed in it.

BUOYANCY, RESERVE

The floating or buoyant power of the unsubmerged portion of the hull of a vessel. Usually referred to a specific condition of loading.

BURDEN

The carrying capacity of a vessel expressed in long tons.

BURNERS

Men who operate gas torches for burning plates and shapes to proper sizes for assembly into the structure.

BURR

The rough, uneven edge of a sheared or burned plate or around a punched or burned hole. Also a washer shaped piece of metal through which the rivet is inserted and against which the rivet point is riveted over.

BUTT

That end or edge of a plate or timber where it comes squarely against another piece, or, the joint thus formed. The long edge of a plate is called the edge and the short edge is called the end.

BUTTOCK

The rounded-in overhanging part on each side of the stern in front of the rudder, merging underneath in the run.

BUTTOCK LINES

The curves shown by taking vertical longitudinal sections of the after part of a ship's hull parallel to the ship's keel. Similar curves in forward part of hull are "bow lines".

BUTT STRAP

A term applied to a strip of plate serving as a connecting strap between the butted ends of the plating. The strap connections at the edges are called seam straps.

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