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For example, a typical stadia mark pair are set so that the ratio is 100. If one observes a vertical length on a stadia rod, rule or levelling rod with the telescope and sees that the rod spans 0.500 m between the marks (the stadia interval), then the horizontal distance from the instrument to the rod is: 0.500m x 100 = 50 m.
The tenths of a foot point is indicated by the top of the long mark with the upward sloped end. The point halfway between tenths of a foot marks is indicated by the bottom of a medium length black mark with a downward sloped end. Each mark or space is approximately 3mm, yielding roughly the same accuracy as the metric rod.
The stadion (plural stadia, Ancient Greek: στάδιον; [1] latinized as stadium), also anglicized as stade, was an ancient Greek unit of length, consisting of 600 Ancient Greek feet . Its exact length is unknown today; historians estimate it at between 150 m and 210 m.
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.
Stadia mark, crosshairs on the reticle of a theodolite or other surveying instrument; Stadiametric rangefinding (also stadia method), a technique of measuring distances with a telescopic instrument; Stadion (unit) (plural: stadia), an ancient Greek unit of length
The top mark is at 1,500 mm and the lower is at 1,345 mm; the distance between those two marks is 155 mm, yielding a distance to the rod of 15.5 m. Optical levelling, also known as spirit levelling and differential levelling, employs an optical level, which consists of a precision telescope with crosshairs and stadia marks.
2 stadia 369.9 m (404.5 yd) double pipe hippikon ἱππικόν: 4 stadia 739.7 m (808.9 yd) length of a hippodrome [5] milion μίλιον: 8 stadia 1.479 km (1,617 yd) Roman mile: dolichos [4] δόλιχος: 12 stadia 2.219 km (1.379 mi) long race parasanges, or league [6] παρασάγγης: 30 stadia 5.548 km (3.447 mi) adopted from ...
The top center "chevron" (^) is used as the main aiming mark. The horizontal hash marks are for windage and lead corrections and can be used for ranging purposes as well. To the left is a stadiametric rangefinder that can be used to determine the distance from a 1.7 meters (5 ft 6.9 in) tall object/person from 200 metres (219 yd) (2) to 1,000 ...