182 On a new Photo-Lithographic Process. 



The coating of albumen also performs an important part in 

 giving the paper a smooth and dense surface before that of 

 gelatine is applied, whereby the quality and uniformity of the 

 latter is much improved ; and lastly, it has the effect, after 

 coagulation, of preventing the ink coming in contact, while 

 washing, with the fibrous substance of the paper, the advan- 

 tage of which is the production of cleaner and more delicate 

 transfers, 



10th. I also regard as a very valuable part of my invention 

 the means I have employed to glaze the coatings of both 

 albumen and gelatine, with a view of getting the most delicate 

 results, the possibility of glazing in the way described being 

 one of the advantages I derive from working on paper. 



11th. I can from the same negative produce an unlimited 

 number of transfers, all equally good, so as to put any num- 

 ber of drawings of the same object upon one large stone, or 

 upon different stones, so as to expedite business by employing 

 several presses at once. 



12th. The photographic delineation of a design can by my 

 process be transferred to the stone with astonishing rapidity, 

 one man doing the work of a dozen draughtsmen, and in 

 many cases of a much larger number. 



13th. I can also boast of actual superiority as regards the 

 quality of some fine description of work over what it is pos- 

 sible to do by hand. 



14th. In washing off the ink advantage is taken of the 

 gelatinisation of the gelatine in cold, as well as its solu- 

 bility in hot water, the swelled surface of the print enabling 

 considerable friction to be applied without injuring the 

 work. 



I will now recapitulate more concisely the new features 

 and advantages of my invention, viz : — 



1. Its simple and practical character. 



2. The thorough lithographic nature of the drawings when 

 transferred. 



3. The " direct" results obtained, working at the same 

 time from a common negative. 



4. The use of photographic transfer paper, whereby the 

 difficulties attending manipulations on the stones themselves 

 are avoided. 



5. The sharpness of detail produced by causing the ink to 

 adhere to the altered gelatine where it has been in intimate 

 contact with the negative. 



6. The stock of sensitive paper which can be kept on hand. 



