482 
PROFESSOR A. SCHUSTER OH THE DIURHAL 
Fig. 3. 
Greenwich. 
Compai'ison between calculated and observed curve of West force. The abscissie 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. 
Fig. 4. 
St. Petersburg. 
Comparison between calculated and observed curve of West force. The abscissm denote astrouomica 
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. 
