268 
PHYSICS: HULL AND RICE 
by the reflection, in the first and second order respectively, of those 
wave-lengths which are capable of stimulating the characteristic radia- 
tion of silver, that is, those which are shorter than the gamma line of 
silver. The edge of the band therefore marks the position of the 7 line 
of silver, 0.488 A.U. In the same way the band terminated at Br is 
3" ^° 5° 
FIG. 3 
due to the bromine in the photographic plate, and marks the position 
of the 7 line of bromine. 
The remaining nine lines, a k, belong to the L spectrum 
of tungsten, and agree with those found by Barnes,^ with the inclusion 
of two faint lines not observed by Barnes. The line marked h appears 
to be a doublet. Gorton's^ values are all about 2% smaller. 
