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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Welty's most cinematic story, "The Hitch-Hikers" consists of nine scenes with temporal ellipses of varying lengths in between.
First hitch-hiker Robert Jeynes, who shared a car with Huntley and his then girlfriend Maxine Carr on August 6, described how Huntley told him he was the last person to see the girls alive.
The hitch-hiker flung himself out of the car and dashed into the nearest pub.
Alongside ex-Beatle Harrison are showbiz luminaries including Hitch-Hiker's Guide to the Galaxy author Douglas Adams and Goon Show founder Sir Harry Secombe.
A YOUNG man who is driving a car to another state is terrorised by hitch-hiker Rutger Hauer, who turns out to be a serial killer.
This week, a student who gave a lift to a venomous hitch-hiker...
If the school boosters club or athletic department sponsor some kind of special winter-sport program, you should make every effort to get included in the project, but not as a hitch-hiker. Nothing is more irritating than to invite yourself to a "party" and then let everyone else do all the work.
She continues on with her journey and picks up a young hitch-hiker - Killer played by James Caan, an attractive brain-damaged football player, and a threatening traffic cop played by Robert Duvall.
12% of men but only 0.5% of women would stop to pick up a hitch-hiker;
Tony, who lives in Cefn Ilan with his partner Claire, 29, and their three-year-old son Aaron, is convinced his non-venemous hitch-hiker got on board when he took two teenage boys and a teenage girl from Penyrheol at around 8.30pm on March 2 or 3 to the Piccadilly pub on Pontygwindy Road in Caerphilly.
SPACED OUT: Ford Prefect (David Dixon) left, and Arthur Dent (Simon Jones) return in Hitch-hiker's Guide To The Galaxy, BBC2, 11.20pm, while Sally has big problems with bullying son Ben in Bad Behaviour, Channel 4, 9.00pm