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A fault of strata common in coal measures, accompanied by displacement.
A minor dislocation of a vein or stratum not exceeding in extent the thickness of the vein or stratum.
(mining engineering)
A step cut in the rock face to hold timber support in an underground working.
A hole cut in side rock solid enough to hold the cap of a set of timbers, permitting the leg to be dispensed with.



in agriculture, a device for attaching several machines to a tractor in order to use the pulling force of the tractor efficiently and to increase the productivity of the unit. Hitches may be general-purpose, special-purpose, trailer, semimounted, or mounted.

General-purpose trailer hitches are used to connect tractors with trailed machines. They consist of two or three beams equipped with extension arms and support wheels and hinged to follow the terrain irregularities better. The machines and extension arms are attached to the beams with clamps that can be moved to ensure correct positioning of the machines or equipment in the unit. The hitch has a tongue for attachment to the tractor. Special-purpose hitches do not usually have wheels; they are composed of links that join the machines to each other, as in plowing combines.

Semimounted hitches are used to attach a tractor to a unit of three mounted machines, each with a working width of 1.8–2.8 m. One machine is fitted to the mounting system of the tractor, and the two others are attached to side mountings on the hitch, similar to the tractor’s own mounting system. Each mounting on the hitch is equipped with a hydraulic cylinder that is operated by the tractor’s hydraulic system; it is used only for lifting the mounted machine. The machine is lowered by its own weight. The proper spacing of machines with different working widths can be achieved by moving the carriage of the hitch’s mounting mechanism along the beam.

A general-purpose hitch can be used to mount harrow units on tractors of small and medium capacity. The harrow units are attached to the post and brackets of the mounting by means of a hinged brace, two long chains, and one short chain. In order to mount harrow units of different working widths, the brackets of the mounting are moved along the beam. One hitch beam can carry three toothed harrow units or two latticed harrow units. A hitch beam may be extended by inserting two tubes in openings in both sides of the beam. The tubes are smaller in diameter than the beam and are welded to brackets for mounting one toothed harrow unit each, for a total of five harrow units.


References in periodicals archive ?
Then birching was abolished "and girls no longer hitch-hike home, violence has increased, the police, whose arrival at the scene of rowdyism used to send offenders fleeing, now find the hooligans waiting for them".
Anyway, it was freezing cold so we decided it was a bad idea and set off to hitch-hike back home.
This seems like such a simple thing to fix and asking a little girl to hitch-hike seems so ridiculous.
She decided to hitch-hike and was offered a lift by two youths who drove to an isolated spot and allegedly raped her, Ansa reported.
White House officials initially insisted that it was necessary for the president to hitch-hike a ride on a warplane to the Lincoln because it was too far from shore to be reached by helicopter.
I'll hitch-hike or kip down on someone's floor when I can, but I'm no stranger to sleeping rough so I'm not afraid to do that if the worst comes to the worst.
Anyone who's been to the Cote d'A'zur will know on that budget they would have to hitch-hike there, put up in a tent and serve guests half a baguette and a glass of plonk.
Soon, I saw the truck that had gone ahead overturn," said Rajya, a woman who had taken a hitch-hike ride in the ill-fated truck.
THEATRE: Fredonia tells the story of two guys who hitch-hike across America to Fredonia & the Marx Bros convention.