36 TRANSACTIONS OF TfiE AMERICAN INSTITUTE. 



The Chemical Section of the Polytechnic Association, to which 

 was referred the articles exhibited in competition for premiums' 

 under provisions established by the Board of Managers of the " 

 Institute, respectfully report : 



That they have examined in full section and through special 

 committees, the various articles exhibited, and submit the fol- 

 lowing as the result of their labors : 



Ormsbee's Camera Box. 



This Camera Box is designed to facilitate the production of 

 two or more photographic impressions on one plate, and as in 

 most other boxes used for the same purpose, the various portions 

 of the plate are brought successively into the field of the lens 

 by the movements of the plate-holder. In this box the move- 

 ments and adjustments are made by brass work, thus securing 

 the nicest accuracy. The box is also suitable for all the ordi- 

 nary photographic uses, and, in short, is a happy combination 

 of all the most desirable qualities of a camera box for practical 

 work. We recommend that the large silver medal be awarded 

 to the inventor. 



Burnett's Ventilator for Sick Rooms and Hospitals. 



This device consists of a refrigerator containing ice, to the 

 bottom of which is attached a light hose of varnished cloth. In 

 operation, the ice-box is placed on a shelf at a suitable height 

 above the bed, and the hose led to the locality to be cooled; a 

 current of air is at once established from the refrigerator down- 

 ward through the hose from which it issues, cooled, and, to a 

 considerable extent, purified ; if desired, it is of course practi- 

 cable to have the ice-box so disposed, that the fresher air from 

 outside the sick-room may be used. We recommend that a 

 bronze medal be awarded to the inventor. 



Selleck's Method of Coating and Cementing Iron with Frank- 



LINITE. 



The specimens exhibited by Mr. Selleck, of soldering and plat- 

 ing wrought and cast iron with the Franklinite metal, indicate 

 to the section the probability of an entirely new branch of indus- 

 try. Several members have witnessed with great interest the 

 methods of working, and are of opinion that it is practicable to 



