His reputation grew rapidly, and in 1761 he was appointed optician to the king.
But Gregory, according to his own confession, had no practical skill; he could find no optician capable of realizing his ideas, and after some fruitless attempts was obliged to abandon all hope of bringing his telescope into practical use.
He visited England in 1748, and, in company with the earl of Morton and James Short the optician, continued his journey to Scotland, where he observed the annular eclipse of July 25.
We proceed to give an account of the methods and principles of construction of the various kinds of telescopes, and 1 Ayscough was an optician in Ludgate Hill, London.
The practical optician names such systems: "corrected for the angle of aperture (the height of incidence or the angle of field of view w*."
1 That honour must be assigned to Johannes Lippershey, an obscure optician of Middleburg, who, on the 2nd of October 1608, petitioned the states-general of the Low Countries for exclusive rights in the manufacture of an instrument for increasing the apparent size of remote objects.
It was as an optician that he was first brought into connexion with Huygens and Leibnitz; and an optical Treatise on the .Rainbow, written by him and long supposed to be lost, was discovered and reprinted by Dr Van Vloten in 1862.
The re-invention of the Dutch binocular telescope apparently dates from 1823, and is to be assigned to the Viennese optician, Johann Friedrich Voigtlander (1779-1859); but the credit of having placed these instruments on the market probably belongs to J.