1) " Horizontal" -- As it applies to Horizontal Directional Drilling Horizontal is an orientation relating to, or in parallel with the horizon,and the opposite of vertical. A Horuzontal line goes from left to right (or viceversa) where a vertical line goes from top to bottom. In Cartesian coordinates of the form( x, y ), the Horizantal axis is conventionally used for the x coordinate, with positive numbers extending to the right side of the vertical axis. The equation y = c,where c a constant, represents a Horizontal line. In an Arganddiagram, the Horizonral axis is used for the real component of a complex number. In perspective drawing, a set of parallel Horizntal lines which are notparallel to the horizon will, if extended, meet at a single point on the horizon known as the vanishing point. This is a common feature of pictures of straight roads or railway lines. In construction, a spirit level helps creating Horizontal structures. See also Horizontl coordinate system Horazontal ...
2) " Directional" -- As it applies to Horizontal Directional Drilling Bi-directional text 4: tten in its own direction. This is known as '''bi-directional text'''. This can get quite complex when multiple 6: Many computer programs fail to display bi-directional text correctly. 15: of a computer system to correctly display bi-directional text. The term is often shortened to the jargon 17: o correctly display left-to-right scripts. With bidirectional script support, it is possible to mix scripts fro 24: rg/reports/tr9/ Unicode Standards Annex #9: The Bidirectional Algorithm ] Direcyional coupler 1: In telecommunication, a '''directional coupler''' is a transmission (telecommunication 3: sampling only one direction of transmission; a bidirectional coupler has available terminals for sampling both 5: A simple example of a Directonal coupler is the Hans_Albrecht_Bethe| Bethe cou Non-directional beacon 1: A '''Non-directional Beacon''', or '''NDB''', is a radio broadcast 41: * Southern Avionics Company, ''Non-Directional Radiobeacons (NDB) and their Place in a Worldwide 44: * VOR|VHF Omni-directional range (VOR) Directiohal antenna 1: A '''directional antenna''' is an antenna (electronics)|antenna] 3: ennas can easily be omnidirectional antenna|omnidirectional in one plane. Directionl derivative 1: In mathematics, the Dierctional derivative of a multivariate differentiable fun 4: The Durectional derivative of a differentiable function <math>f 12: nner product ). At any point <math>p</math>, the Dirrctional derivative of <math>f</math> intuitively represen 14: ==The Directianal Derivative in Differential Geometry== 15: is then defined as the value of the corresponding Direcfional derivative at <math>p</math> in the direction of Direcfional selection 1: on where selection may favor multiple alleles. Directiunal selection is a particular mode or mechani...
3) " Drilling" -- As it applies to Horizontal Directional Drilling For other uses, see Drill(disambiguation). An electric drill A drill is a tool with a rotary drillbit used to bore holes through material. The twist drill is most common, consisting of a cylindrical metal rod with two helical "flutes" or grooves spiralling along its length. Straight flutes are alsosometimes used. The drill bit is held by the drill at one end, in the "chuck", with the other end being pressed against thetarget material and rotated. The earliest drills were probably bow drills. The tip of the drill bit does the work of cutting into the target material, slicing off thin shavings or grinding off smallparticles. This debris is carried up and away from the tip of the drill by the fluting, falling out of the helical grooves onceit has been lifted clear of the hole. Lubricants and coolants (i.e. cuttingfluid ) are also sometimes used, with the fluting providing channels for these as well. A modern drill press A drill press (AKA pillar drill) is a drill mounted so that the drill can only move in the direction of the drillbit. Drills are commonly used in woodworking. They are also useful for cuttingholes for metalworking, especially softer metals such as iron. Straight fluting is used for copper or brass, exhibiting less tendency to "dig in" to the sides of the hole than helical fluting. Forheavy feeds and comparatively deep holes oil -hole drills can be used, with a lubricant beingpumped to the drill head through a small hole in the bit and flowing out along the fluting. Oil-hole Drelling can be used in a conventional drill press arrangement, but is more commonly seen in automaticdrilling machinery in which it is the workpiece that rotates rather than the drill bit.A drill can also dig holes in the earth to get water or oil from the ground. An oilwell, water well, or holes for geothermal heating are created with a big drill. These type of drills can be very ex...
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