LXIV THE ROYAL SOCIETY OF CANADA 



Government buildings by means of several secondary master-clocks 

 continuously synchronized from the Observatory by the method 

 mentioned in a previous report. In addition, relays beating seconds 

 are maintained in several offices in the city, time-signals are sent out 

 by telegraph and telephone; the time is recorded on the various seis- 

 mographs, and a time-ball is dropped on Parliament Hill. 



Geophysics. 



The two Bosch horizontal photographic pendulums the Spindler 

 and Hoyer vertical, with mechanical registration, have been in con- 

 stant operation during the past year. The efficiency of the former 

 has been increased by replacing the hardened steel cup supports or 

 bearings by jewels (diamonds). During the calendar year 1914, 76 

 distant earthquakes were recorded besides the local one of Feb. 10, 

 1914, of which a monograph is now in press. 



The delegate for Canada to the International Seismological 

 meeting at Petrograd which was to convene in August, had his journey 

 thither terminated at London by the war. 



The undagraph installed at Chebucto Head, outside of Halifax 

 harbour, after considerable delay in permanently securing the sea end of 

 the pipe, is now in constant operation, and the resulting undagrams 

 are undergoing examination with the corresponding seismograms 

 showing microseisms, for correlation of ocean waves with microseisms. 



The study of the deformation of the earth under the influence 

 of the moon and to a less degree by the sun, is now about being begun 

 by the installation of the particular apparatus in the vault especially 

 constructed therefor at the Observatory. The principle of the ap- 

 paratus is that of a horizontal pendulum with Zollner suspension. 



The magnetic survey of Canada undertaken by the Observatory 

 has progressed satisfactorily and 37 stations were occupied, besides 

 Ottawa and the base-station Agincourt. The greater number of the 

 stations are in a virgin field, being along the new Transcontinental 

 railway. As heretofore the three magnetic elements, — declination, 

 inclination and intensity have been observed. 



Similarly the systematic gravity survey of Canada completed 

 its first season's work, occupying 18 stations between Tadoussac and 

 Windsor. The observations with the half-seconds pendulum are 

 relative, but as repeated observations with the apparatus were made 

 at Washington, absolute values for gravity are obtained, so that 

 thereby our observations will be linked up with those of the United 

 States, and also with the international series. 



There is a growing public demand, coming from all parts of 



