TERRESTRIAL MAGNETISM — BAUER. zbj 



and July i, 1883. Professor Schmidt has been assisted principally 

 by Drs. Nippoldt and Briickmann, both of the Potsdam Observatory 

 staff, who have taken charge for him of the work of the computers 

 especially employed for this investigation. 



V. Miscellaytcous. — The preparation of a card catalogue of publi- 

 cations and investigations in terrestrial magnetism and terrestrial elec- 

 tricity and allied subjects has been continued, as also the collecting of 

 information of work done and being done, so as to avoid as far as pos- 

 sible needless duplication. A summary of papers on " Earth cur- 

 rents " has been published in the March, 1905, issue of the journal 

 " Terrestrial Magnetism and Atmospheric Electricity," by Mr. J. E. 

 Burbank, magnetician, under the title " Earth currents and a pro- 

 posed method for their investigation." He also completed for the 

 department a first compilation of the ' ' Earthquake disturbances 

 recorded on the magnetographs of the United States Coast and Geo- 

 detic Survey," the records having been kindly put at his disposal 

 for this purpose by Mr. O. H. Tittmann, Superintendent of the Coast 

 and Geodetic Survey. This has been published in the September 

 issue of the said journal. A second compilation is in preparation. 



FIELD WORK PERFORMED. 



In pursuance of the plan for the completion of a general magnetic 

 survey of the accessible regions of the globe within a period of 1 5 to 20 

 years and of the general investigation of the secular variation, the 

 following observational work is now in actual progress : 



A. M.^GNETic Survey of the North Pacific Ocean. 



A wooden sailing-vessel, the brig Galilee, of San Francisco, built 

 in 1 89 1 -length, 132.5 feet; breadth, 33.5 feet; depth, 12.7 feet; dis- 

 placement, about 600 tons, carrying a crew of ten men and sailing 

 master — was chartered of Matthew Turner, of San Francisco, and was 

 fully adapted for the purposes of the expedition. 



After the various necessary alterations were made, e. g. , substitu- 

 tion of the steel rigging by hemp rigging, etc., the vessel, after hav- 

 ing been inspected by the President of the Institution, entered upon 

 her duties early in August. Magnetic observations were made at 

 various places on the shores around San Francisco Bay, and the most 

 suitable place for swinging ship by their aid was determined. The 

 ship was swung with the aid of a tug on August 2,3, and 4, in San 

 Francisco Bay, between Goat Island and Berkeley, California, and 

 the various deviation coeflficients were determined. 



