10. 
II. 
Ls 
. PHOTOGRAPHS OF VOCAL Corps IN ACTION ON DIFFERENT 
PircHEs. Showing the rotation of the aretynoid carti- 
lages and consequent shortening of the vibrating jength 
of the cords. 
Nos. 5-9, exhibited by W. Hallockand F. S. Muckey. 
R6ONTGEN PHoTocrapus. Exhibited by W. L. Robb, W. 
W. Griscom and W. Le Conte Stevens. 
RGNTGEN PHOTOGRAPHS AND APPARATUS. Exhibited by 
O. N. Rood. 
. Ps—eupO-RONTGEN PuHoToGRAPHS. Exhibited by H. S. 
Curtis. Made by sunlight through an ebonite slide. 
. MAHLER’s MopiIFIcATION of Berthelot’s Calorimeter. Ex- 
hibited by J. Struthers. 
. THompson’s CALORIMETER. Exhibited by J. Struthers. 
. Lovisonp TINTOMETER. Exhibited by C. F. Chandler. 
. Micro-STEROGRAPH. Exhibited by O. N. Rood. Taken 
by a special method. 
- MopIFICATION OF REGNAULT’S SpEciIFIC HEatT Appa- 
RATuUS. Exhibited by the Department of Physics, of 
Columbia University. 
EE CRRICEEY. 
C 
In CHARGE oF M. I. PuPin. 
1. APPARATUS for studying long electric waves, and curves, 
plotted from experimental data, illustrating the distribu-- 
tion of long electric waves along a conductor. Exhibited 
by Prof. M. I. Pupin. 
An alternating electric current is propagated along a 
long conducting line, say a telephone wire, by a series of 
progressive waves. The exhibit represents an artificial 
conductor of 500 miles in length corresponding to a long 
distance telephone line of the same length and the meas- 
