DEPARTMENT OF TERRESTRIAL MAGNETISM. 297 



cayo, it is hoped that the straw insulation in connection with the design 

 of the variation-observatory walls, which include many dead-air spaces, 

 mil reduce the range within the niagnetograph room so that it will be 

 not much in excess of 0?1 C. per day. 



Every facility is being extended Dr. Edmonds by the Peruvian 

 Government and the privilege of free entry of all materials and appa- 

 ratus has been given. 



MISCELLANEOUS OBSERVATORY WORK. 



Additional observatory intercomparisons were obtained during 

 March 1920 by Observer F, Brown at the Joao Capello Observatory 

 at Loanda, Angola. This is a government observatory under the 

 Portuguese Marine Department. At the time of Mr. Brown's visit 

 the observatory was in charge of the commandant of the port. Ar- 

 rangements were just being made to install self-recording magnetic 

 instruments, and it was expected that in April 1920 a director would be 

 sent from Lisbon with self-recording instruments to set up a complete 

 magnetic observatory. It is also expected that Mr. Brown will secure 

 intercomparisons with the instruments used by the Rev. P. Colin, S. J., 

 at Tananarive, Madagascar. During the Carnegie's stay at Lyttelton, 

 New Zealand, intercomparisons were made with the standards of the 

 Christchurch Observatory. 



The necessary general instructions for the observatoiy work have 

 been prepared from time to time. Various materials and supplies 

 have been ordered and forwarded for both the Watheroo and Huan- 

 ca3^o magnetic observatories. A system of binding and filing magneto- 

 grams so that they will be kept flat has been devised. The work of 

 final reductions of the data obtained at Watheroo during 1919 to 1920 

 was under way at the end of the year. The chief of the Magnetic Sur- 

 vey Division and Dr. S. J. Mauchly, chief of the Section of Terrestrial 

 Electricity, made a special examination at the Cheltenham Magnetic 

 Observatory of the United States Coast and Geodetic Survey on June 

 29, concerning the possible installation of instruments for atmospheric- 

 electric and earth-current work. A special joint report upon the 

 results of this examination was submitted to the Du'ector, who, in 

 conjunction with Dr. W. van Bemmelen, during his visit to Washington 

 in June, had also investigated the possibilities of future cooperative 

 work in terrestrial electricity with the Coast and Geodetic Survey. 



For a brief account of Mr. Fleming's visits to magnetic observatories 

 in Brazil and Argentina, see pages 293 and 295. 



The work accomplished in terrestrial electricity at Washington is 

 described on pages 283 and 307. 



