VARIATION OF TERRESTRIAL MAGNETISM. 
48L 
Fig. 1. 
Bombay. 
Comparison between calculated and observed curve of West force. The abscissm denote astrouomical 
time, the ordinates tbe force to geographical West, the unit of force being C.G.S. 10~®. 
Observed curve, white line. Calculated curve, dotted line. 
Fig. 
2 
Lisbon. 
Comparison between calculated and obseived curve of West force. The absciss® denote astronomical 
time, the ordinates the force to geographical West, the unit of force being C.G.S. 10~®. 
Observed curve, white line. Calculated curve, dotted line. 
MDCCCLXXXIX.— A. 3 Q 
