SIGNS 



TO DENOTE HOW THE 



LATITUDES, LONGITUDES, AND HEIGHTS 



HAVE BEEN DETERMINED. 



O Meridian altitude, or circummeridian observation of sun. 

 ■tk " " " " stars. 



© Observation on tbe parallel. 

 \l " " meridian. 



A Triangulation. 



% Equal or double altitude of sun. 

 T " " stars. 



Altitude and azimutb of sun and stars. 

 H Azimutbal bearing. 

 X Meridian distance by cbronometers. 

 • Eclipses or occupations. 



Moon-culminating stars. 

 Dt£ Lunar observations, 

 f Barometer. 

 X Sympiesometer. 

 $ Altitude and base. 

 9 Dip. 



§ Determination on shore. 



The Capital Letters are used to denote the name of the observer, where 

 other authority than our own has been adopted for positions. D.R., where 

 there has been no observation but the ship's reckoning. 



10G 



