Proceedings of the Photographical Section. 985 



the salts of lead for the removal of hyposulphite of soda in silver 

 prints, after being taken from the fixing solution. 



Adjourned. 



April 2, 1872. 



Mr. Henry J. Newton in the «hair; O. G. Mason, Esq., Secretaiy. 



Mr. II. T. Anthony exhibited several graphotype prints, and gave 

 a detailed description of the process by which they were produced. 

 He also exhibited a collection of stereoscopic views made' by Mr. W. 

 II. Jackson, of Washington, D. C, while acting as official photo- 

 grapher to the recent government expedition for the exploration of 

 the Yellow Stone region. He also exhibited J. W. Moses' device, 

 consisting of a spring and strips of bibulous paper attached to the 

 plate-shield, for absorbing the silver solution which drains from the 

 plate during exposure in the camera. 



Mr. John Stock exhibited his recently patented apparatus for 

 working wet plates in the field, without a tent or a chemical room. 

 The device consists of a plate-shield with front and back slides, a 

 sensitizing box and developing box, so constructed as to admit of 

 the operator's watching the action of the several solutions used. 



Mr. Dolan explained the method of using the apparatus, and 

 exhibited photographic prints from negatives made in it by Mr. 

 Montgomery, at Brady's gallery on Broadway. 



Mr. Stock also exhibited a camera box so constructed as to be 

 packed in a very small space and yet be very firm, and well adapted 

 to the requirements of field or tourist photographer. Then followed 

 a general discussion on wet-plate apparatus. Hudson's, Edwards' 

 and various English inventions for wet-plate work in the field, were 

 commented upon at some length. 



Messrs. C. W. Hull and O. G. Mason described their experience 

 in the use of green glass for the windows of tents and chemical rooms 

 for photographic purposes. Mr. II. T. Anthony and Mr. C. "W". Hull 

 were appointed a committee to make a series of experiments, with a 

 view of determining upon the best tints of glass for use in windows 

 of photographic chemical rooms. 



Mr. II. J. Newton exhibited duplicate negatives, printed upon dry 

 plates from collodio-chloride positives, in the preparation of which 

 he had used a trace of bromide salt. He spoke of the experiments 

 in this country and abroad for imparting to light a peculiar tint, or 



