202 SEC. 7. LIGHT. 



9281. Ten Photographic Prints from waxed paper nega- 

 tives on albumenized paper, 1853. 



Robert Sabine, Regent's Park. 



928m. Two Sheets of Talbotype Prints from waxed 

 paper negatives. Robert Sabine, Regent's Park. 



928n. Two Views for the Reflecting Stereoscope; 



the varnish used to render the prints transparent, having preserved 

 the details of image from fading. Robert Sabine, Regent's Park. 



929. Specimens of Dujardin's photo-engraving process. 



Dujardin, Paris. 



930. Specimens of Photo-type Printing on Zinc. 



Capt. Abney, R.E. 

 930a. Photo-engraving of a Group of Sun Spots. 



W. de la Rue, F.R.S. 



931. Gillot's Photo-type Process. Veuve Gillot. 



932. First known Photograph on Glass, taken on pre- 

 cipitated silver chloride, by Sir J. Herschel. 



Professor A. Herschel. 



" Having precipitated muriate of silver in a very delicately divided state from 

 water very slightly rnuriated it was allowed to settle on a glass plate ; after 48 

 hours it had formed a film thin enough to bear drawing the water off very 

 slowly by a siphon, and drying. Having dried it I found that it was very 

 little affected by light, but with washing with weak nitrate of silver and drying 

 it became highly sensible. In this state I took a camera picture of the tele- 

 scope on it. Hypomess. soda then poured cautiously down washes away the 

 muriate of silver, and leaves a beautiful delicate film of silver representing the 

 picture. If then the other side of the glass be smoked and black varnished 

 the effect is much resembling daguerreotype, being dark on white as in nature, 

 and also right and left as in nature, and as if on polished silver." Sir J. 

 Herschel. 



933. Second Daguerreotype, obtained by Daguerre in 1839. 

 Lithographic stone of Poiteven, with a proof on paper. 



Conservatoire des Arts et Metiers, Paris. 



935. Photographs by Paguerre. M. Fizeau, Paris. 



937. Specimens illustrating the History of Photo- 

 graphy. French Photographic Society, Paris. 



937a. A Daguerreotype full-length Portrait, taken in 

 Paris in 1840, by special appointment, on the roof of a house in 

 the open air, at 6 a.m. Exposure 20 minutes ! in June sun. 



James Martin. 



937b. Original Book of Experiments made by Sir J. 

 Herschel on the metallic Salts sensitive to Light. 



Professor A. Herschel. 



