JOSEPH VON FRAUNHOFER (1787-1826), German optician and physicist, was born at Straubing in Bavaria on the 6th of March 1787, the son of a glazier who died in 1798.
Reichenbach and Liebherr; and in 1807 arrangements were made by Utzschneider for his instruction by Pierre Louis Guinand, a skilled optician, in the fabrication of flint and crown glass, in which he soon became an adept (see R.
At the end of the annealing process the glass issues in the shape of disks or slabs slightly larger than required by the optician in each case.
JOHN DOLLOND (1706-1761), English optician, was the son of a Huguenot refugee, a silk-weaver at Spitalfields,' London, where he was born on the 10th of June 1706.
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.
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.
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 practical optician names such systems: "corrected for the angle of aperture (the height of incidence or the angle of field of view w*."