Hemmpesed to High

Hemmpesed oil to Hickory
Hempseed oil. (Paint.) Obtained from the hemp plant. The oil, when fresh, is light green, but becomes brow­nish yellow on standing. It is used in paints, varnishes, and in soft soaps.
Henry. . (Elec.) An electrical unit of inductance. A circuit has an induct­ance of one henry when a current changing at the rate of one ampere per second induces an e.m.f. of one. volt in the circuit.
Hepple-white. (Furn.) This style, .named after George Hepplewhite of London (died 1786), was much in fluenced by Chippendale, the Broth­ers Adam, and the French. The clas­sic motif r:uns through all his de­signs, yet serverity and coldness are missing. Inlay on mahogany was freely used. Shield, heart:-shaped., and oval chair backs were desings commonly used by Hepplewhite.
Heptagon. A plane figure having seven sides and seven angles.
Hermaph rodite caliper. '(Mach.) A caliper in which one leg is pointed as in pair of dividers, the other being slightly hooked as in the ordinary outside caliper.
Herring-bone. (Masonry) The name given to masonry or brickwork laid in a pattern.
Herring-bone bond. (Masonry) A zi~zag arrngement of bricks or tile, in which the end of one brick is laid at right angles aga:inst the side of a second brick.
Herring-bone gear. A gear in which the teeth slope both ways from a center line of the gear face, as would be the case if two spiral gears, one left hand and one right hand were fastened together; used for heavy work on mining machinery; etc.
Herring-boning. (Fu17l;) A veneered detail consisting of two narrow bands of striped veneer, cut ob­liquely and placed together, resem­bling herringbone patterns in half­timbered work.
Heterodyne. (Radio) The "beating" of one frequency on a carrier fre­quency to produce an audible tone for continuous wave transmission, as. for Morse code communica­tions.
Hewing. The dressing of timber by chopping or by blows. from an edged tool. .
Hexagon. A plane figure having six sides and six angles. All sides of a regular hexagon are equal. All angles are equal; their sum totals 720 de~.
Hexagonal socket set-screws. See ADen set-screws.
Hexagon nut. The ordinary six-sidesform of nut.
Hex head. (Mach.) A common ship expression refferring to screws and bolts and hexagonal heads.
Hickey. (Elec.) Fixture hickey-A small threaded fitting of brass or iron placed in a fixture assembly between the stem and the support to provide an outlet for the wires coming out .of the. fixture stem. Conduit hickey-A pipe-bending device used for bending conduit or other pipe to the desired shape.
Hickory. (Wood) Tree of the walnut family. Its wood is hard, tough, and difficult to work; used extel1­

Hidden surface line to High relief

sively in work which requires bending.
Hidden surface line.Line drawing in short dashes indicates the surface of a hidden part.
Highboy. (Furn.) A tail chest of dra­wers mounted on legs.
High brass. (Metal.) Commercial sheet and strip brass containing about 65 per cent copper and 35 percent zinc. Used for spinning; also i for drawing and forming.
High bulk (Papermkg. and Print.) A tenn descriptive of book paper whose thickness is relatively great compared to substance weight.
High carbon steel. (Metal.) A rather general term applied to steels of more than 0.50 per cent carbon, of good tempering qualities, and suit­able for cutting tools.
High commutators bars. (Elf!.c.) Due to mechanical faults, segments or bars of commutators often rise above adjacent bars through the centrifu­pi force set up by the revolving armature.
High compression. (Auto. Mech.) A Slate of compressibility of gases, usually in a combustion chamber, brought about by a small amount of compression space in the upper part of the chamber.
High discharge. (Elec.) A heavy flow of current from the storage battery.
High fidelity radio. (Rad.) A radio designed to provide the most faithful.sound reproduction possible by a balanced combination of tuner, amplifier, and speaker systems. The high frequency response, low frequency response and the distor­

.High flashing point.When oil will ignite only at a very high temprature,it is said to have a high flashing point.
High frequency. (Elec.) An alternat­ing current having many thousandr of alternations or cycles per second.
High gloss. (Paint;) Paint which dries with a lustrous, enamel-like finish.
High lead bronze. (Metal.) An alloy containing about 75 per cent cop­per and varying percentages of tin
and lead. Its principal use is for bearings operating under high speeds.
High light. (Furn.) A term used in the finishing of furniture, when fini­shes are blended from a darker to a lighter shade, or vice-versa.
High mica. (Elec.) ~ica which is higher than the coppr commutator bars of the armature due to slower wear. .
High potential. (Elec.) A high volt­. age of six hundred or more volts.
High-potential testing transformer. (Elec.) A specially constructed transformer designed to supply several desirable high voltages to be used for testing insulations, etc.
High-presssure cylinder. The smal­lest cylinder .of a compound en­gine which receives the steam di­rectly from the boiler. In this cyl­inder the steam is first expanded, and then it is exhausted into the adjacent low-pressure c¥linders.
High relief. (Fum.) Carving in which the design stands out, at least in parts, farther fTom the background