16 C F. Himes—Preparation of Photographic Dry-Plates. 
Arr II.—Preparation of Photographic Dry-Plates by Daylight, 
by desensitizing and re-sensitizing the silver compounds ; by 
Ui 7 
Prof. C. F Himxs, Ph.D., Dickinson College, Carlisle, Pa. 
HE inconveniences, and the unpleasant, prolonged confine- 
ment in the dark room, connected with the 
tion of dry-plates, more particularly by the tannin process, 
dageat in the commercial preparation 
embodying, in a measure, a similar principle proposed to be 
<7 in photographing the transit of Venus, render fur- 
ther a 
] 
in the usual argentic nitrate bath, in bright se Aa and are 
then thoroughly rinsed, or washed, in a tray of distilled water 
tes, b: 
immersing them, in the dark, in a solution of tannin of 15 
ltt ites a ee 
