xiv Proceedings. [Jauuary 14th, igo8. 



The nearest approach, it seems to me, to what has been the 

 aim of so much research, may now be seen in the Autochrome 

 Photography of Messrs. Lumiere, of Lyons. Some details of the 

 process were pubhshed by the authors some years since, but it 

 is not possible to give full particulars here. The exact method 

 of preparing the plate is not published, but it is known that the 

 plates are coated with starch grains stained in three colours — 

 violet, bright green, and bright orange. The glass has a tacky 

 coating, and on this the starch grains are spread in an even 

 layer, by dusting or otherwise. The spaces between the grains 

 are filled with a black pigment. 



This method is now said to be modified by crushing the 

 granules until they fill up the spaces so as to cause the light to 

 pass through the starch only. A coat of varnish protects the 

 plate which is afterwards overlaid with an emulsion sensitive to 

 the red rays. The plate is then ready for exposure in the 

 camera. The photograph is taken through a yellow screen, the 

 glass side of the plate being placed towards the lens. 



The chief advantage of the new method is that, after the 

 production of the plate, the ordinary routine of photographic 

 work is all that is required to produce the transparency in 

 colour. 



General Meeting, January 28th, 1908. 



Professor H. B. Dixon, M.A., F.R.S., President, in the Chair. 



Mr. Thomas William Fox, M.Sc.Tech., Professor of 

 Textiles in the School of Technology, Manchester, zj, Clarendon 

 Crescent^ Eccies, and Mr. William Myers, Lecturer in Textiles 

 in the School of Technology, Manchester, Sfone Edge, Marple, 

 were elected ordinary members of the Society. 



