DEPARTMENT OF TERRESTRIAL MAGNETISM. 283 



Chief assistance was rendered Dr. Barnett and Dr. Mauchly, by- 

 Messrs. D. M. Wise and A. Thomson, and occasional assistance by 

 Messrs. H. R. Grummann, C. A. Kotterman, T. C. Kiesel, and M. B. 

 Smith. For details of work, see page 296. 



STANDARDIZING AND INSTRUMENT WORK. 



The work under this head has continued in Mr. Fleming's charge. 

 On pages 293 and 299 he makes a detailed report, from which the fol- 

 lowing synopsis has been prepared : 



(a) Considerable work in the overhauling, improving, repairing, and 

 constructing of instruments and appliances for the observa- 

 tional and experimental investigations of the Department was 

 accomplished with the available shop-force. 



(6) Compass-variometers in improved form were designed and con- 

 structed, as well as an inertia-gimbal system for the elimination 

 of dynamic and magnetic deviations in instruments for use on 

 shipboard. 



(c) The string galvanometer (see p. 313), designed and constructed 



by the Department, was arranged for use with the marine earth- 

 inductor on the Carnegie. 



(d) Improvements in the Carnegie's equipment for ocean atmospheric- 



electric work. 



(e) Partial construction of sine-galvanometer for measuring horizontal 



intensity of Earth's magnetic field. (See pp. 294 and 300.) 

 (/) Designing of the electric installation on the Carnegie and design and 

 construction of the switch-boards for the Carnegie and the 

 Experiment Building. 



The Department has continued to make all non-magnetic castings for 

 the various instruments in its own small brass foundry. The success 

 achieved here has attracted the attention of others, who have applied 

 for and received instructions in the methods employed. 



The personnel of the shop consisted of Messrs. C. Huff, G. H. Jung, 

 W. F. Steiner, instrument makers; A. Smith, carpenter and pattern- 

 maker; J. G. Lorz, apprentice. 



MISCELLANEOUS ACTIVITIES. 



Besides the activities of members of the Department, described in 

 the previous pages, an account will be found under "Abstracts" of 

 papers contributed to learned societies and special conferences. In 

 connection with the meeting of the American Physical Society, the 

 Department took part in the display of instruments. From time to 

 time the research committee of the Department has met in the Direc- 

 tor's study for discussion and presentation of scientific subjects of 

 special concern and interest. 



The Director, after the return to England of his eclipse expedition to 

 Cape Palmas, Liberia (see pp. 311-313), represented the United States 

 Weather Bureau at the preliminary conference of official weather- 



