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Reflecting circle, Circle of Borda, Theodolite

The reflecting circle was invented by the German geometer and astronomer Tobias Mayer in 1752, with details published in 1767.  His development preceded the sextant and was motivated by the need to create a superior surveying instrument.
Jean-Charles de Borda further developed the reflecting circle. He modified the position of the telescopic sig...

The reflecting circle was invented by the German geometer and astronomer Tobias Mayer in 1752, with details published in 1767.  His development preceded the sextant and was motivated by the need to create a superior surveying instrument.
Jean-Charles de Borda further developed the reflecting circle. He modified the position of the telescopic sight in such a way that the mirror could be used to receive an image from either side relative to the telescope. This eliminated the need to ascertain that the mirrors were precisely parallel when reading zero. This simplified the use of the instrument. Further refinements were performed with the help of Etienne Lenoir. The two of them refined the instrument to its definitive form in 1777. This instrument was so distinctive it was given the name Borda circle.

A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes such as meteorology and rocket launch.

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Reflecting circle, Circle of Borda, Theodolite There are 3 products.

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