46 Ocean Magnetic Observations, 1905-16 



Table 1. — Summary of Deviafion-Coefficienls of the Galilee, San Francisco Bay, May S3, S5, and 28, 1008. 



MAGNETIC OBSERVATIONS MADE ON COURSE. 



The following observations wnll serve as specimens of a typical day's work at sea. To 

 show what is possible under not the very best conditions, the day selected is April 14, 1908, 

 on the passage of the Galilee from Callao, Peru, to San Francisco. On this day the observ- 

 ing conditions were as follows: roll of vessel for a. m. decUnation observations, 10° to 20°, 

 hence 30° from side to side; roll of vessel for p. m. dechnation observations, 5° to 15°, hence 

 20° from side to side ; roll of vessel, during observations of magnetic incUnation and intensity, 

 from side to side 30°; weather, be (clear, blue sky, clouds) ; sea, M (moderate sea, or swell) ; 

 wind, SE and having a force of 3-4 (Beaufort scale) ; temperature, 26° C. 



Complete astronomical and magnetic observations were made on this day, of which 

 specimens of the latter follow. 



