429 Dr. T. H. Havelock. The Propagation of [Aug. 26, 
Table IV. 
a =sin—!4//(p). | ce] / (gh). 
90° 
19°28" 
SSS 
CMGf. 1G. 
Fy 
| by editor 
on next page. 
Fic 9. 
32 
