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Sights with finer increments (1/8 MOA) or coarser (1/2 MOA) are to be found, but are less commonly seen on iron-sighted full bore target rifles. Shooters may use a foresight lens of no greater magnification of +0.5 dioptre (Focal Length 2M) and a single corrective lens or variable dioptre not exceeding 1.5x magnification in the rearsight.
Fullbore target rifle (TR) is a precision rifle shooting-sport discipline governed by the International Confederation of Fullbore Rifle Associations (ICFRA). [1] TR uses single-shot rifles, usually chambered in .308 calibre, with circular "bullseye" targets at distances of 300–1000 yards.
[13] [30] Nevertheless, in 1883, this TBM was used to bore a railway ventilation tunnel — 2 m (7 ft) in diameter and 2.06 km (6,750 ft) long — between Birkenhead and Liverpool, England, through sandstone under the Mersey River. [31] The Hudson River Tunnel was constructed from 1889 to 1904 using a Greathead shield TBM. The project used air ...
A part's-eye view of a boring bar. Hole types: Blind hole (left), through hole (middle), interrupted hole (right). In machining, boring is the process of enlarging a hole that has already been drilled (or cast) by means of a single-point cutting tool (or of a boring head containing several such tools), such as in boring a gun barrel or an engine cylinder.
The Farquharson Rifle is a single-shot hammerless falling-block action rifle designed and patented by John Farquharson (1833-1893), [1] of Daldhu, Scotland in 1872. George Gibbs, a gun maker in Bristol, became a co-owner of the Farquharson patent in 1875 and was the sole maker of Farquharson rifles until the patent expired.
The Advanced Towed Artillery Gun System (ATAGS) [10] is a towed 155 mm/52 calibre howitzer that is being developed for the Indian Army by Armament Research and Development Establishment (ARDE), Tata Advanced Systems (TASL) and Kalyani Strategic Systems (KSSL).
Directional boring machine. Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig.
An extended-range high-explosive (ER HE) projectile being developed to replace the L15 HE projectile. The projectile features a streamlined shape and a screw-on base bleed unit to increase range. Utilising the Silver Bullet Precision Guidance Kit it has a CEP of less than 20 m. Maximum range is stated as 30 and 40 km (19 and 25 mi) from 39 and ...