Reflecting instrument

A sextant that has been used for over a half century. This frame shows one standard design – that with three rings. This is one design that has been used to avoid thermal expansion problems while retaining adequate stiffness.

Borda's reflecting circle, on display at Toulon naval museum

Reflecting instruments are those that use mirrors to enhance their ability to make measurements. In particular, the use of mirrors permits one to observe two objects simultaneously while measuring the angular distance between the objects. While they are used in many professions, they are primarily associated with celestial navigation, as the need to solve navigation problems, in particular the problem of the longitude, was the primary motivation in their development.

单词	Reflecting circles
释义	Reflecting circles 英语百科 Reflecting instrument Reflecting instruments are those that use mirrors to enhance their ability to make measurements. In particular, the use of mirrors permits one to observe two objects simultaneously while measuring the angular distance between the objects. While they are used in many professions, they are primarily associated with celestial navigation, as the need to solve navigation problems, in particular the problem of the longitude, was the primary motivation in their development.
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Reflecting circles

Reflecting instrument