Proceedings of the Peotographical Section. 977 



PEOOEEDINGS 



PHOTO GRAPHICAL SECTION 



AMERICAN INSTITUTE. 



October 3, 1871. 



Vice-chairman H. G. Newton presiding ; O. G. Mason, Esq., Secretary. 



The committee on " The preparation and keeping of sensitized 

 paper" reported progress. 



Mr. H. T. Anthony stated that he had prepared paper, of good 

 keeping quality, by floating twice on plain croton or soft water ; 

 then immersing, for a moment only, in a two-grain solution of oxalic 

 acid, saturated with oxalate of silver, which was formed by adding a 

 small quantity of nitrate of silver. The paper was famed before 

 printing, or printed w T ith fumed pad or cushion in the printing frame. 

 He also stated that II. O'Niel had found that silvered paper drawn 

 through a saturated solution of alum, and thoroughly dried, would 

 keep in good printing condition six days. The photographic prints 

 exhibited were very fine in tone, the white portions appearing as 

 pure as upon paper used immediately after silvering. A series of 

 very fine photographic prints, made by J. Edward Smith, of Paines- 

 ville, Ohio, were exhibited. The paper had been sensitized by 

 Anthony's alum bath, containing only twenty grains of silver to the 

 ounce, and the prints fixed after Newton's acetate of lead formula. 



A member inquired whether the lead contained in such solution 

 would not have an injurious effect upon the health of the operator 

 using it ? Mr. Newton replied that its chemical combination was 

 such as to render it quite harmless when so used. 



Two photographic prints, made by Mr. M. Carey Lea, of Phila- 

 delphia, in illustration of his collodio-bromide process, were received, 

 [Inst.] 62 



