19S YEAR-BOOK OF FACTS. 



in order to refract the image of the sun without dispersion, and to 

 define more correctly the lines of the negative ; and a no less 

 important condition for losing nothing of the photogenic raj's would 

 be, to have it formed with a glass perfectly homogeneous and colour- 

 less. With such improvements, the solar camera will become capable 

 of producing results of the greatest beauty ; and, without any 

 question, its introduction into the photographer's studio will mark a, 

 period of considerable improvement in the art. 



Thus has Mr. Claudet qfcown that in order to obtain a perfectly 

 good picture of any size from a small negative — in order to obtain a 

 portrait, for instance, the size of life from a miniature the size of a 

 visiting card — all that is necessary is to have recourse to Woodward's 

 solar camera, provided it be accurately made, and so adjusted that 

 the focus of the condensing lens fall exactly on the front lens of the 

 camera obscura, neither behind it nor before it, as is common in the 

 instruments as usually made. 



MULTIPLICATION OF PHOTOGRAPHS BY STEAK. 



A PAPER was read before the American Photographic Society on 

 13th August, 1800, by which it appears that twelve thousand photo- 

 graphs or stereographs an hour can now be produced from a single 

 negative by means of condensed or focalized light and simple ma- 

 chinery worked by a crank. A sheet of ordinary paper, sensitized, 

 was exhibited, containing 300 of these photographs. Mr. Charles 

 Fontayne, of Cincinnati, Ohio, is the inventor of the process. The 

 prepared or sensitized paper is simply passed, in a continuous sheet, 

 before a negative, in a box, where condensed light is made to pene- 

 trate through the negative and impress its image upon the paper, 

 which it does in "03 of a second for each impression. The con- 

 densing lens is 7 inches in diameter. Thus, as it is said, " the 

 illustrations for a book, having all the exquisite beauty and perfec- 

 tion of the photograph, may be turned out by the use of this machine 

 with a rapidity wholly undreamed of either in pL f or in 



lithography." The cost of engraving, also, will of course be dis- 

 pensed with. All sorls of drawings, tco, may be thus multiplied, 

 as well as actual objects photographed or stereographed, in cheap 

 and endless profusion. The Architects' Journal, of New York, 

 publishes a print thus produced from a rough sketch by the ordinary 

 ammonio-nitrate process. 



VITIIEOUS PHOTOGRAPHS. 



Among the most admired things in the last Exhibition of the 

 Society of Arts were specimens of Vitreous Photographs, produced 

 by .Mr. I'. Joubert ami Mr. John Wvard. These specimens are 

 entirely novel, and in reference to the pbotographio art are lil 



tey not only give to the photograph the 

 permanence of any image which is prodaoed in a glass or poi 



i hi also admit of a combination of a variety of colours in tho 

 of photographic subjects. Among the specimens shown 



