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K-Type Truss: See Figs. 22gg and 22hh
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| Fig. 22gg | Fig. 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.
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| 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.
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| where | v = velocity in feet per second |
| C = a coefficient |
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| r = hydraulic radius | |
| s = sine of slope | |
| and | n = 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.