Developed and patented by James M. Leatherwood, the Adjustable Ranging Telescope (ART) system combines a rangefinding scale inside the telescopic sight (scope) with an adjustable cam built into the scope's mount that raises or lowers the rear of the sight to compensate for the trajectory of the bullet. A telescopic sight, commonly called a scope, is a device used to give additional accuracy using a point of aim for Firearms Airguns and Crossbows A cam is a projecting part of a rotating Wheel or shaft that strikes a Lever at one or more points on its circular path Trajectory is the path a moving object follows through space The object might be a Projectile or a Satellite, for example The cam is preset for a specific cartridge; i. e. the 7.62 mm NATO round. The 762x51mm NATO is a Rifle cartridge developed in the 1950s as a standard firearm cartridge among NATO countries In use, the shooter first estimates the range utilizing the scale or scales visible through the scope, then adjusts the cam to that specific range. This then allows the shooter to place the scope's aiming point directly on the target without having to hold over or under to compensate for the bullet's rise and fall.
As a brief history; during the Vietnam War the U.S. Army found that they desperately needed snipers. The Vietnam War, also known as the Second Indochina War, or the Vietnam Conflict, occurred in Vietnam, Laos and Cambodia The United States Army is a military organization whose primary mission is to "provide necessary forces and capabilities. READ DISCUSSION PAGE BEFORE MAKING ANY EDITS TO CAPTION BELOW http//en They were losing troops to enemy snipers and had no capability of retaliating in kind. Their major problem was that the classic training of a sniper in range estimation, ballistics, compensation for weather or climate variables, and precision shooting is a lengthy process and they didn't have the time. READ DISCUSSION PAGE BEFORE MAKING ANY EDITS TO CAPTION BELOW http//en Ballistics ( gr βάλλειν ('ba'llein' "throw" is the science of Mechanics that deals with the motion behavior and effects of Projectiles The weather is a set of all the phenomena occurring in a given Atmosphere at a given Time. Climate encompasses the temperatures humidity rainfall atmospheric particle count and numerous other meteorogical factors in a given region over long periods of About this time, Lieutenant Leatherwood, who already had the patents for his ART system, entered the Army and began working with U. Lieutenant (abbreviated Lt or Lieut) is a Military, Naval, Paramilitary, Fire service, Emergency medical services S. Army Ordnance [1] specialists. The combination of the Leatherwood ART with M14 National Match rifles to produce what became the M21 Sniper Rifle, allowed the Army to place competent snipers in the field with all line units. The M21 Sniper Weapon System (SWS is the semi-automatic Sniper rifle adaptation of the popular M14 rifle.
Modern "civilian" versions of this system are sold by Leatherwood Optics [2] and a more detailed Manual of the scope and its mounting system are available there.
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