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Telescopic fishing rods are designed to collapse down to a short length and open to a long rod. 20-or-30-foot (6 or 9 m) rods can close to as little as one and a half feet (45 cm). This makes the rods very easy to transport to remote areas or travel on buses, compact cars, or public buses and subways.
Telescopic cylinder. Telescopic cylinders are a special design of a hydraulic cylinder or pneumatic cylinder as well as pulley system which provide an exceptionally long output travel from a very compact retracted length. Typically the collapsed length of a telescopic cylinder is 20 to 40% of the fully extended length depending on the number of ...
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. Stadiametric rangefinding is used for surveying and in the telescopic sights ...
Jack post. A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches ( shoring ). They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces. Most examples use removable pins for ...
Level staff. A level staff, also called levelling rod, is a graduated wooden or aluminium rod, used with a levelling instrument to determine the difference in height between points or heights of points above a vertical datum . When used for stadiametric rangefinding, the level staff is called a stadia rod .
The longer the focal length of the eyepiece, the greater the eye relief. Typical telescopic sights may have eye relief ranging from 25 mm (0.98 in) to over 100 mm (3.9 in), but telescopic sights intended for scout rifles or handguns need much longer eye relief to present a non-vignetted image.
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