Hard iron to Hay rope
Hard iron. Cast iron which is dense and close-grained. It is lighter in colour than soft iron.
Hardness. (phys.) The resistance a body offers to being scratched or worn by another substance. Hardness is expressed in terms of minerals in ascending order by the Mohs scale: I, talc; 2, gypsum; 3, calcite; 4, fluorite; 5, apatite; 6, feldspar; 7, quartz; 8, topaz; 9, sapphire; 10, diamond.
Hardpans. A layer of rock under soft soil.
Hard-sized. (Papermkg.) A paper size to resist penetration of moisture and ink.
Hard solder. (Shopwk.) A ~older composed principally of copper and zinc. Also known as "spelter." the terms hard soldering and brazing are often used interchangeably.
Hard top. (Auto. Mech.)A passenger automobile, either two door or four door, with a metal top and no sidecenter post supports..
Hard water. Water containing a large quantity of compounds of calcium and magnesium in solution.
Hardwood. Wood which is closegrained, dense, and heavy, as oak, hickory, ash, and beech.
Hardy. (Frog.) A square-shanked chisel or fuller for insection in the hardy hole of a smith's anvil or block.
Hardy hole. (Forg.) The square hole in an anvil which receives the shank of the hardy. "
Harewood. (Wood.) Originally from West Indies; owing to limited supply a substitute was developed by a dyeing process of the English sycamore. Colour: Silver gray with satinlike cross streaks. Used for furniture and panels.
Harmonize. To make a pleasant, harmonious arrangement of parts.
Hasp. A fastening as for a door, usually passing over a staple, and secured by a peg or padlock.
Hatchet copper. (Sheet-Met. Wk.) A soldering copper with the head set at right angles to the handle. Shaped like a hatchet.
Hatchet iron. (Plumb.) A special form of soldering iron.
Hatchet stake. A tool used by tin smiths for "bending sheets of tin.
Hatchings. (Draft.) Panillel or crossed lines, usually at an angle of 45 deg., giving the effect of shading; used to indicate a section in drawing.
Hatchway. (Arch.) An opening covered by a trap door, as in a roof, to permit easy access for repairs; or in a ceilig to give entrance to anattic. "
Haunch. The shoulder of an arch. Haunched mortise and tenon.
(Woodwk.) A joint in which the tenon is reduced in width for a portion of its length, the mortise being cut to fit.
Hawk. (Plaster.) A small, square board with handle underneath, used to hold plaster or mortar.
Hawser-laid rope. Made of three small right-handed ropes laid up into one.
Hay rope. (Fdry.) A rope made of hay, used in the making of foundry cores. The" rope is wrapped
Heaz.e to Heater tube
around a core bar, then covered with loam, the hay forming a porous mass through which the gases may be carried off.
Heaze. (Pfost.) Indefinite cloudy appearance in a transparent plastic; described as "internal" or "surface."
Head. (Pri1lt.) The title of a news . article; also the top of a page or book.
Headband. (Pri1lt.)A decorative band placed at the head of a page or chapter in a printed book.
Header. A brick or stone placed with its end toward the face of a wall.
Header joist. (Arch.) The joist into which the common joists are framed around openings for stairs, chimneys, etc.
Heading tool. (Forg.) A tool used for shaping the heads of bolts. The body of the bolt is passed through a hole in a plate and the end of the bolt flattened against it while hot to form the head.
Headless set screw. (Mech.) A setscrew which, instead of having a head, has a slot to permit adjustment by a .screw driver.
Head of water. (Phys.) The vertical distance between the highest level and the point from which the water-head is being measured; e.g., the vertical distance between level of water in a standpipe and the faucet from which water is drawn.
Headpiece. (Prillt.) Any ornamentation placed at the top of a page in a book or pamphlet.
Head room. (Bldg.) The vertical space between a stair and the ceiling or stair above. (Tel.) Leeway between subject's top and top of set or picture.
Head set. (Elec.) Also called earphones. Two flat receivers connected by a spring which holds them in position over the ears.
Headstock. (Mach.) The fixed head of a lathe which carries the faceplate or chuck.
Heart earn. (Mach.) A earn, heartshaped inform, used for the conversion of rotary into redfJrocal motion.
Hearth. (Bldg.) The floor of a fireplace including that portion in front of it.
Heart wood. (Wood) The central part of a tree, surrounded by the sapwood; contains no living cells.
Heat. A non-medianical energy transfer with reference to a temperature difference between a system and its surroundings or between two parts of the same system; symbol Q.
Heat capacity. The heat required to raise the temperature of a substance one Celsius degree.
Heat distortion point. (Pfast.) Temperature at which a standard bar of plastic material will be deflected .010 in.
Heat engine. (Elec.) An engine that converts the energy of heat into mechanical or kinetic energy, such as steam and internal combustion, reciprocating and turbine engines, rocket engines, ramjet engines.
Heater. The element of a vacuum tube that carries the current for heating a cathode.
Heater tube. (Elec.) A large, tubular, carbon, filament lamp or tube of
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