for proceeding from deeper to shallower water. These will be recognized 

 as a rearrangement of Snell's Lawj and would result in protractors 

 identical with those contained herein for angle changes up to about 13° c 



HEFERENCES 



(1) Isaacs J, Jo Do, Memorandum on Drawing Refraction Diagrams Mrectly by 

 OrthogonalSj Univ. of Calif ^5 Fluid Mech. Lab.^ ^t Fffi;-ll6~47, 

 194.^5 (impublished), 



(2)' Johnson, Jo V/a, Mo P. O'Brien^ and J» D. Isaacs, Giaphical Construction 

 of Wave Refraction Bia grams. Ho 0» Publo 605, 19^ » 



(3) Munkj, Wo Ho and Ro So Arthur ^ Wgve Intensity Along a ffefracted Ray, 

 Symposium on Waves, National Bureau of Standards, I95I3 in press* 



3U 



