266 CARNEGIE INSTITUTION OF WASHINGTON. 



Results were obtained for eleven paths, based mostly on the data of British 

 Admiralty Charts Nos. 3775, 3776, and 3777, and partly on Chart No. 2598, 

 all for the epoch 1922. The paths all begin on the meridian of Greenwich 

 and extend eastward from the following latitudes: 50°, 40°, 30°, 20°, and 

 10° north, the equator, 10°, 20°, 30°, 40°, and 50° south. The path that 

 begins at the equator lies partly north and partly south of the equator. Ac- 

 cordingly, it has been omitted in deriving the different means. The mean 

 lack of closure for the northern paths is 21.2 statute miles southward of the 

 starting-points, while for the southern paths the mean is 59.6 statute miles 

 northward. These distances correspond to an average deviation of the 

 compass-needle, in the northern hemisphere equal to 3' east and in the 

 southern hemisphere 9' west of north. 



Equipment, installations, and work of Watheroo Magnetic Observatory.^ G. R. Wait. 



This paper gives a general account of the location, site, and buildings of 

 the Watheroo Magnetic Observatory, with particulars as to the instrumental 

 equipment and present and contemplated schedule of observations and 

 personnel. Continuous registrations of the three magnetic elements (declin- 

 ation, horizontal intensity, and vertical intensity), of both positive and 

 negative electrical conductivity of the air, and of earth-currents on under- 

 ground and aerial lines, are being obtained, together with the necessary 

 control observational data for the interpretation of the magnetograms and 

 electrograms. A full program of meteorological observations is being carried 

 out also, more particularly for the investigation of any relations to the atmos- 

 pheric-electric work. Apparatus for recording the potential gradient of 

 the atmosphere is to be installed soon. It is hoped to add seismographs also. 



The attempt is made to keep the tabulation of data as nearly current as 

 possible, thus permitting compilation and publication of results at the main 

 office of the Department of Terrestrial Magnetism in Washington. Reports 

 regarding magnetic storms, atmospheric-electric and earth-current dis- 

 turbances, magnetic character of days, earthquake records on magnetograms, 

 and other matters of current interest, are regularly communicated to inter- 

 ested organizations and through the Journal of Terrestrial Magnetism and 

 Atmospheric Electricity. The meteorological results are supplied regularly 

 to the Commonwealth Weather Bureau of Western Australia. 



The successful initiation and realization of the observatory's scientific 

 work was made possible through the cordial and interested cooperation of the 

 Government officials and of the scientific men of Western Australia. 



Earthquake records, Watheroo magnetograms, November 1921. G. R. Wait. Terr. 



Mag., vol. 27, 167 (December 1922). 

 Magnetic and atmospheric-electric disturbances and auroral displays, Western Australia, 



January 1923. G. R. Wait. Terr. Mag., vol. 28, 49 (March-June 1923). 



These articles give brief accounts of earthquake effects and of magnetic 

 and atmospheric-electric disturbances recorded at Watheroo Magnetic 

 Observatory, Western Australia, together with notes from various sources 

 regarding auroral displays noted at several places in Western Australia. 



Earthquake records, Huancayo magnetograms, October to November 1922. W. F. Wallis. 



Terr. Mag., vol. 27, 167 (December 1922). 

 Earthquake records, Huancayo magnetograms, September 1922 to April 1923. W. F. 



Wallis. Terr Mag., vol. 28, 48, 49 (March-June 1923). 



These articles give brief accounts of the earthquake and the magnetic 

 phenomena indicated as recorded on the magnetograms obtained at the 

 Huancayo Magnetic Observatory, Peru. 



' Presented before the Second Pan-Pacific Science Congress held during August 13 to September 

 3, 1923, at Sydney and Melbourne, Australia. 



