53 



10. Photomicrographic Prints of Various Objects. Ex- 



hibited by E. G. Love and H. S. Stearns. 



11. Photographic Prints. Illustrating methods of printing 



and kinds of paper. Exhibited by J. W. McKenzie and 

 W. E. Woodbury, and through J. G. D. Knight, Corps 

 of Engineers, and R. Birnie, Ord. Dept., U. S. A. 



12. Glass Positives. Colored and uncolored. Illustrating 



application of photography to geological, astronomical 

 and war studies. Exhibited by the Museum of Natural 

 History, College of the City of New York and the War 

 Department, through J. G. D. Knight, Corps of Engi- 

 neers, and R. Birnie, Ord. Dept., U. S. A. 



L 



PHYSICS. 



In Charge of Wm. Hallock and John F. Woodhull. 



1 . A Row OF 7 BuNSEN Burners with Aluminum Tubes to 



show : 



a. The seven spectrum colors with the evaporated salts as 

 lithium or strontium, red ; calcium, orange ; sodium, 

 yellow ; barium, yellow-green ; thallium, green ; indium, 

 blue ; potassium, violet. 



b. To produce monochromatic light in considerable quan- 

 tity for certain optical purposes. 



c. To produce a pure Bunsen flame of considerable intensity 

 to serve as a light for photographic purposes, and illus- 

 trating its high actinic intensity. 



d. To heat long tubes as a substitute for a combustion fur- 

 nace. 



2. Hard Glass Containing Pieces of Opaque Substances 



AND Metals, to show that Draper's law that all sub- 

 stances become incandescent at the same temperature is 

 not applicable to those which remain transparent at that 

 temperature. 



