The first use of Jena glass in a photographic lens was by Voigtl�nder, but as the lens was an old design its performance was not greatly improved.
2.
Fraunhofer prepared glasses which reduced the secondary spectrum; but permanent success was only assured on the introduction of the Jena glasses by E . Abbe and O . Schott.
3.
These glasses were invented by Ernst Abbe, a physicist, and Otto Schott, a chemist, ( both Germany ) in 1884, working for Carl Zeiss'Jena Glass Works.
4.
He translated from Augustin Privat-Deschanel " Elementary Treatise on Natural Philosophy : Physics " ( 1870, largely rewritten; 6th edit . 1882 ) and, with his daughter Alice Everett, Heinrich Hovestadt's " Jena Glass and its Scientific and Industrial Applications " ( 1902 ).
5.
In all earlier kinds of glass, however, the dispersive power increased with the refractive index; that is, v decreased as n increased; but some of the Jena glasses by E . Abbe and O . Schott were crown glasses of high refractive index, and achromatic systems from such crown glasses, with flint glasses of lower refractive index, are called the " new achromats, " and were employed by P . Rudolph in the first " anastigmats " ( photographic objectives ).
मोबाइल