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Glossary of Bridge Terminology



K-Type Truss: See Figs. 22gg and 22hh

Fig. 22ggFig. 22hh

Kahn Bar: A type of reinforcing bar. Its special feature is the sheared prongs which project from the main stern at an angle of forty-five degrees, approximately, in order to take care of the shear in the beam.

Keckle: To cover or guard by winding with something.

Kedge: A small anchor with an iron stock. To move by the aid of an anchor.

Keel: The principal timber in a boat, vessel, etc., extending from the bow to the stern along the bottom and supporting the whole frame.

Keepers: The pieces of metal or wood which keep a sliding bolt in its place and guide its motion.

Keg: A cask-shaped vessel of indefinite size, but in capacity less than a half barrel, usually from five to ten gallons.

Kellogg Truss: A variation of the Pratt truss. See Fig. 22bb.

Fig. 22bb

Kerf: The space, opening, or narrow slit made in sawing.

Kettle: A vessel of iron, copper, or other metal, of convenient shape and size, used for heating tar, asphalt, etc.

Key: Anything that operates a locking mechanism, or that prevents the movement of parts on each other; such as the central stone of an arch or vault. A piece inserted in a longitudinal slot in a shaft to prevent a pulley or gear from slipping; a piece inserted in the back of a board to keep it from warping; a hand tool for controlling a valve, moving a nut, etc.

Key Bed: In machinery, a rectangular groove made to receive a key for the purpose of binding the parts that are in contact.

Key Bolt: Same as "Cotter Pin." -- A split steel key or pin used to fasten large pins so that they cannot move endwise. Also used to denote the large pin holding the cotter.

Key Pile: The principal pile in a group of piles.

Key-way: A slot cut in a shaft or hub of a gear or pulley to receive the key.

Key Wrench: A socket wrench having a cross handle; also a wrench having one sliding jaw held in place by a key.

Keystone: The centre or highest voussoir or arch stone.

Keystone Column: A structural steel column made of four bent channels riveted together, with thimbles or nipples over the rivets separating the channels.

Kibble: The bucket used for raising earth, stone, etc., from shafts or mines.

Kibble Chain: The chain which draws up the kibble or bucket from the hole.

Kill: To hold molten steel in a laddle, furnace, or crucible until the ebullition of gas ceases and the metal becomes quiet.

Killing: The act of holding steel to kill it.

Kiln: A shaft furnace for roasting ore, limestone, etc., where a very high temperature is required.

Kiln-drying: An artificial method of seasoning timber, in which it is put into a kiln and exposed to a current of hot air.

Kilowatt: An electrical unit of power equal to one thousand watts, or 1.3405 horse-power.

Kilowatt-hour: The customary unit of electric energy, used in the sale of electricity, equal to one thousand watt-hours.

Kinematics: That branch of the science of mechanics which treats of the motion of bodies without reference to the cause or force producing it.

Kinetic: Pertaining to or producing motion.

Kinetic Energy: Energy that is due to motion.

Kinetics: That branch of the science of mechanics which treats of forces causing motion or changing motion in bodies.

King Post: The middle post standing at the apex of a King Post Truss. Also called "Joggle Post."

King Post Truss, or King Truss: Properly a trussed beam with one vertical post at centre.

King Rod: An iron rod used to take the place of a king post.

King Truss: Same as "King Post Truss."

Kink: A knot-like contraction. A twist or a sharp sudden bend in a piece. To twist or contract into knots.

Kip: A sharp-pointed hill; a jutting point. A stress unit equal to one thousand pounds.

Kish: The graphite forced out from molten pig iron during its solidification.

Kit: A kind of cement; lute and putty. A box, chest, or canvas bag for holding tools. To pack in a kit.

Kneaded Rubber: A pliable eraser used to clean drawings.

Knee, or Knee Brace: A short diagonal brace, used to connect a batter brace or a vertical post in a span to an over-head strut.

Knee Brace: Same as "Knee."

Knee-braced Trestle: A trestle provided with knee braces.

Knee-iron: An L-shaped angle-iron used to strengthen a joint formed by two timbers in a frame.

Knee-movement: The movement in a joint like that of a knee.

Kneeler: A pad used on the knee by bridgemen, carpenters, etc., for protecting the knee while at work.

Knife-edge: A sharp edge similar to that of a knife blade. However, it is often applied to rather blunt edges.

Knocking-bucker: A tool made from a strong, flat bar of iron, used for breaking or bucking ore or stone.

Knot: The hard mass of wood formed in the trunk of a tree at a branch, with the grain distinct and separate from the grain of the trunk. A knob in an arch. An intertwining of the parts of one or more ropes, cords, or strips for the purpose of fastening them together. The act of tying a knot.

Knot Maul: A wooden maul having a conical head made from a knot or other tough piece of timber.

Knotty: Having many knots. Said of timber.

Knuckle Gear: A crude form of toothed gearing used for slow-moving machinery, such as cranes.

Knuckle Gearing: A train of knuckle gears.

Knuckle Joint: A flexible joint formed by two abutting links.

Kutter's Formula: A formula for evaluating the coefficient, C, in the following Chezy formula for the mean velocity of the current in a stream.

wherev = velocity in feet per second
C = a coefficient
r = hydraulic radius
s = sine of slope
andn = coefficient of roughness

Kyanizing: A process for preventing the decay of wood by impregnating it with chloride of mercury, patented by J. H. Kyan, in 1832.