Collimators
telescopes used for the determination of the corrections of COLLIMATORS, telescopes used for collimation, for flexure, or for the zenithpoint of a meridian-circle or transit. They are generally fixed upon piers N. and S. of the instrument and pointed toward each other and toward the instrument itself when in a horizontal position. They are adjusted so as to be intervisible when the instrument is lifted out of its Y's, and, on looking into either, the wires of the other are seen alongside those in the field, so that they can be pointed on each other, or the instrument itself upon either in turn. Besides the above arrangement there are many distant meridian-mark takes the place of one of the Collimators, and it is then used also as a reference point for the azimuth-correction of the instrument. are many ; born in one of the Collimators, and it is then an English naval val commander ; Newcastle-upon-Tyne in 1750. He entered the royal navy in 1761, and took part as flag-captain on board the "Barfleur" in Lord Howe's victory of June 1, 1794, commanded the "Excellent" during the battle off Cape St. Vincent on Feb. 14, in that year, and was made rear-admiral of the white in 1799. His most distinguished service was at Trafalgar, where he won the praise of Nelson. On the battle off Cape St. Vincent on Feb. 14, in that year, and was made rear-ad- miral of the white in 1799. His most officer took command of the fleet. For his services here he was elevated to the rank of baron. He died, while cruising off Minorca in the "Ville de Paris," on March 7, 1810. His "Memoirs and Correspondence" have been published.