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Directional drilling (or slant drilling) is the practice of drilling non-vertical bores. It can be broken down into four main groups: oilfield directional drilling, utility installation directional drilling, directional boring (horizontal directional drilling - HDD), and surface in seam (SIS), which horizontally intersects a vertical bore ...
A water resources borehole into the chalk aquifer under the North Downs, England at Albury. Engineers and environmental consultants use the term borehole to collectively describe all of the various types of holes drilled as part of a geotechnical investigation or environmental site assessment (a so-called Phase II ESA).
The revolver is a 'Break Action' self-extracting revolver [4] and uses the .32 Smith & Wesson Long (7.65mm x 23mm) cartridge. [5] It is based on the Webley Mk IV.38 S&W revolver, specifically the Singapore Police Force version with a safety catch.
The common firearms which are provided to people with a license under this Act are double barreled shotguns of 12 gauge (DBBL 12 Bore), common firearms are 0.315 bolt-action rifles (magazine capacity of 5 cartridges) and 0.32 Smith&Wesson Long revolvers (chamber capacity of 6 cartridges), 0.35" semi-automatic pistols and 12 Bore pump-action ...
Rock-quality designation (RQD) is a rough measure of the degree of jointing or fracture in a rock mass, measured as a percentage of the drill core in lengths of 10 cm or more.
They are suitable for use in ground with a strength of up to about 10 MPa (1,500 psi) with low water inflows. They can bore tunnels with cross-section in excess of 10 m (30 ft). A backactor arm or cutter head bore to within 150 mm (6 in) of the edge of the shield. After a boring cycle, the shield is jacked forward to begin a new cycle.
There are two styles of small-hole gauges: full-ball and half-ball. The full-ball gauges are easier to set correctly and maintain, under the pressure of measurement, a better representation of the bore. Half-ball gauges tend to spring just a little bit, and this may be enough to make a measurement incorrect.
The design of the rifle – initially the Rifle 7.62mm 2A – began at the Rifle Factory Ishapore of the Ordnance Factories Board in India, soon after the Sino-Indian War of 1962. [ 4 ] The Ishapore 2A/2A1 has the distinction of being the last bolt-action rifle designed to be used by a regular military force other than specialized sniper rifles .