SEVENTH ANNUAL RECEPTION. 515 



1. Comparison of curves of the stresses set up in 8o-lb, 



rails, and waves in the roadbed under the wheel loads 

 of the Empire State Express, for December 23 and 

 30, 1899, speed 44 miles per hour. 



2. Similar curves for the same train on loo-lb. rails, June 



28 and July 21, 1898, speed 19 miles per hour. 



3. 4 and 5. Tabulations of stresses from which the above 



curves were obtained. 



6 and 7. Photographs of locomotives passing over the 

 stremmatograph, showing the position of counter- 

 weights and volume of exhaust steam. 



8 and 9. Photographs of entire trains passing over the 



stremmatograph. 

 10. Photograph of stremmatograph slide, showing the re- 

 corded strains of several locomotives. 



2. Photographs in Color, by the Grating Principle. 



3. New Form of Pseudoscope. 



4. Kinetoscope Projections of the Motion of a Wave in Va- 



rious Mirrors, and after Repeated Reflection. Nos. 2 

 to 4, exhibited by Prof. R. W. Wood ; University of 

 Wisconsin. 



5. Achromatic Quarter Wave-length Plate. Exhibited by 



Prof. D. B. Brace ; University of Nebraska. 



6. A Sound Wave Anemometer. Exhibited by Bergen Da- 



vis ; Columbia University. 



7. A Series of Prints Illustrating Manly 's Ozotype Process 



of Pigment Printing. Prepared and exhibited by Prof. 

 T. W. Edmondson ; New York University. 



8. Series of Diffraction Photographs. Exhibited by Prof. 



W. S. Franklin ; Lehigh University. 



9. A Variable Potential Rheostat. Exhibited by Prof. W. 



M. Stine ; Swarthmore College. 

 10. Photographs of Manometric Flames. Exhibited by Pro- 

 fessors E. L. Nichols and E. Merritt ; Cornell Uni- 

 versity. 



