ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. 

 Each of the scientific bureaus in Washington has a representative authorized to 

 forward such material to this journal and abstracts of official publications should 

 be transmitted through the representative of the bureau in which they originate. 

 The abstracts should conform in length and general style to those appearing in 

 this issue. 



TERRESTRIAL MAGNETISM.— Results of observations made at the 

 United States Coast and Geodetic Survey Magnetic Observatory near 

 Tucson, Arizona, 1913 and 1914- Daniel L. Hazard. U. S. 

 Coast and Geodetic Survey Serial Publication No. 23. 1916. 

 This publication is in continuation of the series giving the results 

 obtained at the Tucson magnetic observatory since its establishment 

 in 1909. It contains a summary of the monthly determinations of the 

 scale-values of the horizontal intensity and vertical intensity variom- 

 eters; the base-line values derived from the weekly absolute observa- 

 tions; diurnal variation tables for the magnetic elements D, H, and I, 

 the total force F, and the rectangular components X, Y, Z; hourly 

 values of D, H, and Z, together with daily and hourly means for each 

 month; a tabulation of the earthquakes recorded on the seismograph; 

 a list of the magnetic disturbances of considerable magnitude, and repro- 

 ductions of the magnetograms showing the more marked disturbances. 

 Attention is called to the fact that beginning with 1913 intensity results 

 obtained by this Bureau have been reduced to the international stand- 

 ard of the Department of Terrestrial Magnetism of the Carnegie Institu- 

 tion of Washington. Published results for earlier years must be dimin- 

 ished by one part in a thousand to reduce them to that standard. 



D. L. H. 



TERRESTRIAL MAGNETISM.— Solar radiation and terrestrial mag- 

 netism. L. A. Bauer. Terr. Mag., 20: 143-158. 1915. 

 Comparisons have been made between the records of magnetic varia- 

 tions and those of the solar constant as determined by Abbot. If the 

 local magnetic constant G be defined as (H- + \ Z-) h , where H and Z 

 are horizontal and vertical magnetic intensities respectively, it is found 



397 



