204 REPORTS ON INVESTIGATIONS AND PROJECTS. 



ometers for the determination of all the elements except inclination; with 

 accessories and packing these weigh about 25 pounds each. Full descriptions 

 and details of these instruments are to be given in an early number of the 

 journal "Terrestrial Magnetism and Atmospheric Electricity." Magnet- 

 ometers Nos. 16 and 17, similar to No. 12, are now under construction. 



A special form of sighting device has been provided for deflector No. 3, 

 at present used on the Carnegie. The plans have been made for the con- 

 struction of deflector No. 4, which will embody further improvements, as 

 indicated by the experience during the first cruise of the Carnegie. This 

 instrument is now under way. Several pieces of special apparatus for the 

 study of atmospheric electricity and radioactivity of rain and sea water have 

 been constructed for the Carnegie ; the old equipment of such instruments 

 has also been thoroughly overhauled and put in first-class condition. 



During the year numerous improvements and repairs have been made on 

 the outfits in hand ; it has thus been possible to keep all instruments in first- 

 class order and in commission. This has been particularly the case for the 

 dip-circle needles, for which new pivots have been supplied as found neces- 

 sary to replace inferior or rusted ones. The facilities of the shop have been 

 increased by the installation of an engraving machine, and a dividing engine 

 has been ordered ; it will thus be possible soon to construct all parts of our 

 instruments ourselves. 



Mr. Adolf Widmer continues as Chief Instrument-maker under the gen- 

 eral supervision of the magnetician-in-charge. Owing to the increase in the 

 shop work, a second instrument-maker, Mr. E. K. Skonberg, was appointed 

 on April i. 



SPECIAL INVESTIGATIONS. 



(See statement above in general summary regarding investigation of mag- 

 netic storms and intercomparisons of magnetic instruments, as also list of 

 publications by members of the Department.) 



