294 CARNEGIE INSTITUTION OF WASHINGTON. 



INSTRUMENTAL WORK. 



Besides the instrumental investigations already mentioned (see 

 pages 291, and 317-318), several new instruments for observations in 

 terrestrial magnetism and atmospheric electricity have been completed 

 in the Department's instrument-shop, which has continued, as here- 

 tofore, under Mr. Fleming's supervision. Furthermore, the current 

 instrumental equipment has been kept in good repair and the magnetic 

 instruments for observatory work, purchased from the United States 

 Government and formerly used at iVIount Weather Observatory, have 

 been thoroughly overhauled, improved, and in part reconstructed. 

 The Department now has three complete magnetograph outfits. 



The reconstructed magnetic instruments were originally made by 

 some of the best foreign instrument-makers. Despite the splendid 

 workmanship, it was found necessary when overhauling the instru- 

 ments to replace, because of magnetic impurities, a number of the 

 parts. The great importance of securing absolutely non-magnetic 

 metals for magnetic instruments, pointed out in previous annual 

 reports, was thus again emphasized. A small brass-foundry, to insure 

 the making of pure castings, was therefore constructed and equipped 

 and the necessary arrangements were made for refining the raw metals 

 required. 



During the year two of the Department's types of magnetometers 

 have been purchased by foreign governments. 



It is of interest to record here that the Board of Directors of the 

 University of Cincinnati presented to the Department, for its historical 

 exhibit of magnetic instruments, the large Gambey type of magnetom- 

 eter used by Professor Alexander Dallas Bache when making the mag- 

 netic survey of Pennsylvania, 1840-1843. 



Additional experimental direct-current circuits and special bare- 

 wire circuits with special switchboards for the laboratory rooms were 

 completed, and various instrument-cabinets and observing-tables were 

 installed. 



Test runs and adjustments of two of the magnetograph outfits were 

 completed at Washington preparatory to the assignment of the instru- 

 ments for use at the proposed observatories in Western Australia and 

 South America. Both outfits are of the Eschenhagen type. 



DETAILS OF OBSERVATIONAL WORK. 

 OCEAN WORK. 



November 3, 1915, the Carnegie arrived at Lyttelton, New Zealand, 

 and thus concluded her long trip, without stop, of 89 days from Dutch 

 Harbor, Alaska, from which port she had sailed on August 5. Heavy 

 weather was encountered immediately after leaving Dutch Harbor, 



