180 On a new Photo-Lithographic Process. 



I now come to my own process, which, judging as fairly as 

 I can, I believe to be superior to all others, and perfectly 

 distinct and new. I rest its superiority on — 



1st. Its simple and thoroughly practical character, in 

 virtue of which it can be easily learned and executed. 



The utter absence of all specimens of Photo-lithography 

 in this country, save my own, tends to show that processes 

 which have been patented in other countries three or more 

 years ago, either do not pay in the working, or are too diffi- 

 cult, intricate, or imperfect in their details, to admit of being 

 advantageously carried out. 



2nd. I produce by photographic means, a bona fide "trans- 

 fer" in its technical sense, on lithographic paper, in litho- 

 graphic ink, from which the image is conveyed to the stone 

 by the well-known process of transferring, in such a way 

 that it then becomes a genuine lithographic drawing, differ- 

 ing in no one respsct from those produced in the ordinary 

 way, and subject to all the operations and manipulations 

 practised by the lithographic printer ; the ink is not on the 

 stone, separated by any interposed substance, but in it, as it 

 ought to be ; the stone will not wear in the press, or the 

 quality of the drawing suffer by any number of impressions 

 short of 2000 or 3000. 



3rd. My process gives direct results, working as I do from 

 a common negative which may have been prepared anywhere, 

 at any time, or by any person ; I form on the photo-litho- 

 graphic transfer paper a " direct positive," in lithographic 

 transfer ink ; this, by being impressed upon the stone, gives 

 a "reverse positive," from which direct prints maybe" thrown 

 off in the press. 



4th. By using transfer paper I overcome all the numerous 

 difficulties which arise from having to expose a stone in the 

 camera, or from having to expose it under a positive or 

 negative. I exclude stones altogether from the photographic 

 laboratory, and all cumbersome apparatus appertaining there- 

 to. Besides which, the facility with which a piece of 

 paper can be exposed under a negative is very great ; from its 

 flexible nature the most intimate contact can be established 

 between the two, whereby the most minute details are 

 obtainable, and the operator can with perfect safety examine 

 the paper from time to time in the ordinary way, and stop 

 when the change of color is sufficient. 



5th. That part of the photographic picture which in my 

 process takes the ink, is on that surface of the sensitive 



