PHYSICS: E. DERSHEM 65 
The Tungsten X-ray spectrum 
GLANCING ANGLE OF 
WAVE LENGTH 
REMARKS 
REFLECTION FROM ROCK SALT 
IN ANGSTROM UNITS 
Lines of the L group 
lo 10. o 
1 . 45Z° 
Woo lr 
1 CO O O' 
lo y .y 
1 A 702 
1 .11 L* 
Strong 
1 A° 7A C 
14 .54. o 
1 Ai A3 
1.410* j 
Very faint 
16 19.9 
1 .29/' 
Medium 
16 16.1 
1 .280° 
Very faint 
16 l.l 
1 .27o 4 
otrong 
lz 04.4 
1 1 roc 
1 .25o° 
Medium 
12 44.0 
1 .241" 
Strong 
12° 31.3' 
1.220 2 ] 
12° 24.8' 
1.209 8 j> 
Very faint 
12° 4.5' 
1.177 3 J 
11° 34.4' 
1 . 129 2 
Weak 
11° 13.3' 
1.095 3 
Strong 
10° 57.9' 
1.070 5 
Faint 
10° 54.3' 
1.064 8 
Medium 
10° 50.5' 
1.058 7 
Medium 
10° 40.6' 
1.042 7 
Very faint 
10° 29.8' 
1.025 3 
Medium 
9° 22.0' 
0.915 9 
Bromine absorption line 
7° 12.9' 
0.706 8 
4 
Medium 
4° 55.5' 
0.483 3 
Silver absorption line 
Lines of the K group 
2° 9.7' 
0.212 4 
Strong 
2° 6.8' 
0.207 6 
Strong 
1°52.0' 
0.183 4 
Strong 
1°49.0' 
0.178 4 
Medium 
the case of light by the aid of the grating and echelon the number of char- 
acteristic X-ray lines would be found to be as great as the number of light 
spectral lines are now known to be. 
Many thanks are due to Professor Stewart and the Staff of the Physics 
Department of the University of Iowa where this work was performed for 
assistance in this research. 
