H. NAGAOKA. 



, T si fc 37 i /3 2 i.„ , v-i » 3 2 J ,\ 



da; o?/ ' 2 \ox- oxoy ' à y ' / 



The problem is to find the locus of points where the intensity 

 will have a constant value à I near the point of intersection of the 

 bands, which evidently is given by the equations 



<p = o , $ = o 



Putting dl— a given quantity, the equation to the curve of equal 



à "* + " I 

 intensity will be found by using the following values of . m . n at 



point <p=o, y!> = o. 



31 



~\ — = ° 



o X 



v-i _ 



3 x~ 



i*i iu vi vi 



= o 



3 x* 3 ?/ 3 3a; 2 3/y 2sx St/ 2 



3 a: 4 \<i X / \lx / ' 



3 4 7 / 3 çf 3 3^30\3^>3j£ 



3a" s 3?/ ^ \ 3 x 3 ?y 3 // 3 a* / 3 x 3 a- 



» 4 r _ , ry»py/agy , /^y/a y y 3^ 30 3^ 3^-1 



3^3^ _ L\ ^ 7/ / \**/ \3/// \3a'/ "*" 3z 3t/ 3.1- 3 /y J 



3 4 J _ /S«^ <)ji 3^3^\3^30 

 3a 1 3/y s \ 3 x 3 // 3 y 3 ,r / 3 // 3 y 



3t/ 4 - Ä ^iy; \3 /y ; 



