478 
PHYSICS: DUANE AND STENSTROM 
Proc. N. a. S. 
Physical Review. The chief difference between this and previous re- 
searches Hes in fact that we have used spectra of higher orders, thus 
obtaining greater dispersion and precision. 
Measurements of the electric current in the ionization chamber of the 
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spectrometer were made at intervals of 30" of arc on the scale which gives 
the grazing angle of incidence of the X-rays that strike the crystal. The 
curves in figures i, 2 and 3 represent the ionization current as a function 
of the grazing angle of incidence, d, in typical experiments. 
