tarkastelaa

Tarkastel is an observation instrument used by naval vessels to compensate for the curvature of the Earth when ranging on targets by sight. It was invented in the 19th century to correct the range calculated through traditional methods, which could be influenced by the Earth's spherical shape and atmospheric refraction.

The instrument is typically mounted on a rotating platform, allowing it to be aligned with the target. The instrument consists of two lenses, one for directing a beam of light to the target and the other for viewing it. The lenses are adjusted to compensate for the horizontal parallax introduced by the Earth's curvature.

Tarkastel observation has several advantages over traditional ranging methods, including improved accuracy and reduced dependence on the atmospheric conditions. By measuring the angle of elevation and the range to the target, naval vessels can estimate the distance and position of other ships more accurately. This allowed for more effective gunfire control and improved defensive capabilities.

Tarkastel observations were an essential element of naval gunnery during World War I and World War II. The instrument played a significant role in naval warfare, especially in targeting ship and land-based targets. However, it saw limited use in the post-war period, largely replaced by more modern technologies and radar systems, which offered better accuracy and reliability. Today, Tarkastel remains a relatively obscure technical term in the history of naval technology, but its significance to naval warfare is still recognized by historians and military enthusiasts.