ELASTIC PROPERTIES OF DRAWN TUNGSTEN WIRES 211 
TABLE II. 
PER CENT. RANGE 'IN VALUES FOR “n” IN VARIOUS METALS. 
FROM WINCKELMANN. 
Metal 
Per Cent 
Metal 
Per Cent 
Metal 
Per Cent 
A1 
44 
Cu 
33 
Bi 
11 
Pb 
48 
Mg 
45 
Zn 
140 
Cd 
139 
Ni . 
22 
Sn 
13 
Fe 
. 16 
Pt 
0.6 
W 
16 
An 
58 
Ag 
20 
tory of the wire, than on the composition. The proper way to 
study these substances, if we are hoping to get results of value 
in the theory of the constitution, of matter, is to work with in- 
dividual crystals. In that case definite results ought always to 
be had. This work is now being prosecuted in this laboratory. 
The writer wishes to express his appreciation of the assistance 
rendered by Mr. William Schriever, who determined with great 
care the radii of all the wires used. Since the radius enters to 
the fourth power in determining n, it is seen that great care 
must be exerted to measure r. Thanks are also due to Dr. A. 
G-. Worthing of the Nela Laboratory, of Cleveland, Ohio, for 
providing the wires. 
Department of Physics, 
The State University. 
