H-field
An auxiliary vector field that describes the driving magnetic influence produced by free currents, independent of the material's response.
Entries starting with H
199 entries.
H-piece
The part of a plunger pump that contains the valve.
HAC
nounAutomotive
Initialism of hill-start assist control.
hacking
The separation of a course of stones into two smaller courses, when there are not enough large stones to form a single course.
hair bracket
nounManufacturing
A moulding which comes in at the back of, or runs aft from, the figurehead.
hair stroke
A fine line drawn out at the top or bottom of a letter.
half adder
A specific logic circuit that performs an addition operation on two bits.
half shaft
nounAutomotive
Either of the pair of drive shafts that extend from a differential to the wheels.
half-bat
nounConstruction
A bat (brick with one whole end) that is exactly half the length of the original brick.
half-marrow
Either of a pair of young boys employed as putters, pushing wagons in the mine, and dividing their earnings.
half-mast
An unfashionably short length of a pair of trousers.
halftone
A picture made by using the process of half-toning.
halo headlight
nounAutomotive
A kind of headlight arranged in a circular pattern.
hammer blow
nounRail equipment
A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts.
hammer break
An interrupter in which contact is broken by the movement of an automatically vibrating hammer between a contact piece and an electromagnet, or of a rapidly moving piece mechanically driven.
Hamming code
Any of a family of linear error-correcting codes that generalize the Hamming(7,4)-code invented by Richard Hamming in 1950.
hand-tab
verbConstruction
To spot-apply asphalt-based adhesive to shingles for securement and wind resistance.
handblown
adjectiveManufacturing
Blown by hand, without the use of machinery
handbrake
The mechanism, particularly the locking hand-operated lever or foot-operated toggle lever in a motorcar or the hand-operated crank on a railcar, which is used to set and release such a brake.
handbrake turn
nounAutomotive
An automobile driving manoeuvre where the driver starts turning the vehicle and then pulls on the handbrake to make the rear tyres lose adhesion and thus cause the back of the vehicle to slide around (in the direction of the turn).
handle
nounManufacturing
The tactile qualities of a fabric, e.g., softness, firmness, elasticity, fineness, resilience, and other qualities perceived by touch.
handman
One who assembles printing type by hand.
handpress
An early printing press operated by means of a handle that applied pressure on the form.
handwheel
Any wheel worked by hand, whether used to allow leverage, as of a valve or a handbrake, or to allow fine adjustment, as of a set screw.
hanging side
the overhanging side of an inclined or hading vein
hanging wall
the upper wall of inclined vein, or that which hangs over the miner's head when working in the vein.
hard error
A type of error which persists even after power-cycling the equipment; associated with permanent physical damage to the equipment's hardware (for instance, from a latch-up).
hard-wire
To connect components by means of permanent electrical wires.
hardface
verbMetalworking
To apply a harder or tougher material to (a base metal) by welding.
hardhead
nounMetallurgy
Residual ore that failed to melt during a smelting process.
hardrock
Rock containing ore from which minerals are extracted.
hardware description language
Any language from a class of computer, modeling, or specification languages for formal description and design of analogue or digital logic electronic circuits.
hardware node
A physical device that is connected to a network and is able to send, receive, or forward information.
harness
The part of a loom comprising the heddles, with their means of support and motion, by which the threads of the warp are alternately raised and depressed for the passage of the shuttle.
harpoon fork
A kind of hayfork, consisting of a bar with hinged barbs at one end and a loop for a rope at the other end, used for lifting hay from the load by horse power.
harr
nounCarpentry
The stile that bears the hinges of a gate.
harveyize
verbMetallurgy
To treat by, or subject to, the Harvey process.
hash noise
A harsh, pulsating, or buzzy interference signal, often caused by ground loops, electromagnetic interference, or failing components.
hat
nounManufacturing
A covering for the head, often in the approximate form of a cone, dome or cylinder closed at its top end, and sometimes having a brim and other decoration.
hatch
An opening into, or in search of, a mine.
haul road
A road designed for heavy or bulk transfer of materials by haul trucks.
haul truck
An off-road, heavy-duty dump truck specifically engineered for use in high-production mining and exceptionally demanding construction environments.
haulback
A method of surface mining where overburden (the material on top of the coal or ore) is transported from an area and then hauled back after removal of ore or coal.
haulier
A miner who hauls coal from the coalface to the bottom of the shaft.
haze
nounManufacturing
Any substance causing turbidity in beer or wine.
HBT
nounManufacturing
Initialism of herringbone twill.
HDA
nounMetallurgy
Abbreviation of hot-dip aluminization.
HDL
Initialism of hardware description language.
HDR
Initialism of hard disk recorder or hard drive recorder (“a recording device that records onto a hard disk drive”).
HDSL
Initialism of high-bit-rate digital subscriber line.
head
nounMachining
The topmost, foremost, or leading part.
head gasket
The gasket which seals a cylinder head to an engine block in several types of engine, including steam engines and internal combustion engines.
head unit
nounAutomotive
The in-dash control box, excluding the dash-mounted interaction screen.
headband
A thin slip of iron on the tympan of a printing press.
headcode
nounRail equipment
A code used to distinguish classes of train for the benefit of signalmen, formerly by using white oil lamps (or white discs) placed on brackets on the front of the locomotive. The various lamp positions defined the class of train.
header
nounConstruction
A brick that is laid sideways (on its largest face), for example at the top of a wall or within the brickwork, with its smallest side showing (oriented so that that side is wider than it is tall).
headframe
the structure supporting machinery above the entrance to an underground mineshaft.
heading
A gallery, drift, or adit in a mine, particularly one driving through a solid body of coal or ore; also, the end of a drift or gallery; the vein above a drift.
headlight fluid
A fictional ostensible automotive product, used in jokes, to prank someone into searching for the nonexistent item (a snipe hunt), or to gauge how inept someone is in basic auto mechanics.
heapstead
The elevated framework of wood or iron at bank, to the top of which the pit is continued above the surface, to provide the necessary height to pass the coals over the skreens into the wagons.