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A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...
Shooting target. A "splatter"-type paper target — 25 shots at a distance of 91 metres (100 yd), all hitting inside the bullseye within a 25 millimetres (1 in) grouping. An electronic scoreboard used for stangskyting in Norway in 2007 showing the number of hits for each shooter after the first half. Shooting targets are objects in various ...
Two-inch mortar. High explosive: 2 lb 2 oz (960 g). The Ordnance SBML two-inch mortar, or more commonly, just " two-inch mortar ", was a British mortar issued to the British Army and the Commonwealth armies, that saw use during the Second World War and later. It was more portable than larger mortars, and had greater range and firepower than ...
Target archery is the most popular form of archery, in which members shoot at stationary circular targets at varying distances. All types of bow – longbow, barebow, recurve and compound – can be used. In Great Britain, imperial rounds, measured in yards, are still used for many tournaments and these have slightly different rules to metric ...
Smith & Wesson Model 10. The Smith & Wesson Model 10, previously known as the Smith & Wesson .38 Hand Ejector Model of 1899, the Smith & Wesson Military & Police or the Smith & Wesson Victory Model, is a K-frame [2] revolver of worldwide popularity. In production since 1899, the Model 10 is a six-shot, .38 Special, double-action revolver with ...
Scanners and cameras. "PPI" or "pixel density" may also describe image scanner resolution. In this context, PPI is synonymous with samples per inch. In digital photography, pixel density is the number of pixels divided by the area of the sensor. A typical DSLR, circa 2013, has 1–6.2 MP/cm 2; a typical compact has 20–70 MP/cm 2.
The optical format is approximately the diagonal length of the sensor multiplied by 3/2. The result is expressed in inches and is usually (but not always) rounded to a convenient fraction. For instance, a 6.4x4.8 mm sensor has a diagonal of 8.0 mm and therefore an optical format of 8.0*3/2 = 12 mm, which is expressed as inch in imperial units.
Rate of fire. 18 rpm max., 3 rpm sustained. Effective firing range. 770 m to 6,840 m. (840 yd to 7,480 yd) Maximum firing range. 6,840 m (7,480 yd) The M30 106.7 mm (4.2 inch, or "Four-deuce") heavy mortar is an American rifled, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to infantry units.
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