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Stadiametric rangefinding, or the stadia method, is a technique of measuring distances with a telescopic instrument. The term stadia comes from a Greek unit of length Stadion (equal to 600 Greek feet, pous ) which was the typical length of a sports stadium of the time.
A Mk 5 Mod 0 US Navy Stadimeter made in 1942 by Schick Inc. of Stamford CT. The hand held stadimeter was developed by Bradley Allen Fiske (1854–1942), an officer in the United States Navy.
The reticle features a stadiametric rangefinder, ranging out to 400 meters and a single chevron as an aiming point with vertical stadia lines for a windage hold. [6] The PSO-1M2-1 has also been made in a version for the 7.62×39mm intermediate cartridge, which has the range drum marked for up to 1,000 meters. This version has a 400 m stadia ...
Coincidence rangefinders work through the principle of triangulation. In the pictured example, triangulation can be used to determine the range of the ship 𝑑.The position of the lenses A and B are known, and the angle of the lenses α and/or β is set by the operator so that both are aimed at the target.
Stadia marks on a crosshair while viewing a metric levelling rod.The top mark is at 1.500 m and the lower is at 1.345 m. The difference between the rod readings is 0.155 m, yielding a distance to the rod of 15.5 m.
This stadiametric rangefinder reticle was originally used in the Russian PSO-1 4×24 telescopic sight and is calibrated for ranging a 1.7-m-tall target from 200 m to 1000 m. The target base has to be lined up on the horizontal line of the range-finding scale and the target top point has to touch the upper (dotted) line of the scale without ...