1920 .] Adams and Marsden.—The Samoan Observatory. 
159 
view the position of the observatory is unique in its usefulness for all the 
observations it undertakes, as indicated in the following summary :— 
(1.) Magnetic Observations .—The observatory is equipped with modern 
instruments for the determination of the horizontal component of the 
PLAN OF 
SAMOAN OBSERVATORY. 
Fig. 2.—Plan of Samoan Observatory. 
earth’s magnetism, the declination, and the inclination ; also for continuous 
recording of the horizontal component, the vertical component, and the 
declination. The latter records are of a particularly high standard of 
accuracy, especially those of 1905-20, and already many results of far- 
reaching importance have been obtained, particularly with regard to the 
relations of magnetic phenomena with the sun-spots and with general solar 
