SURVEYS IN THE PHILIPPINES 



20- 



ormosa^ 



* 0. 

 Bat 



PHILIPPINE ISLANDS 



an Islands Latitude determinations. 



Longitude 

 Azimuth 



Tidal observations 

 Magnetic observations; 

 Thuzngidation 

 Tbppgrraphy. 

 Hydrograp/ry 

 _ Deep sea soundir 



( telegraphic) .i.y 



log an 

 sorongan 



aan 



a 



z-Hinatuan 



s^vlati 



OUTLINE: MAP OP THE PHILIPPINE ISLANDS, SHOWING THE PROGRESS OP THE 

 TOPOGRAPHIC AND HYDROGRAPHIC SURVEY OP THE ISLANDS 

 BY THE U. S. COAST AND GEODETIC SURVEY 



