APPENDIX C LXXI 



Mackenzie and return instructed the various observers chosen for 

 this special work and also inspected the many Meteorological stations 

 lying between Edmonton and the Arctic Sea. It is to be regretted 

 that the War will probably lead to a lack of that international co- 

 operation which alone could make this investigation effective. 



Seismology. 



The Milne Seismographs at Toronto and Victoria have continued 

 in operation throughout the year. 



On April 30th, 1914, the Victoria instrument was removed to the 

 basement of the new Observatory, the boom being now approximately 

 222 feet above sea level. The number of earth tremors recorded at 

 both stations during the year was one-third greater than is usually 

 recorded, Toronto shewing 108 and Victoria 110. 



Five of the movements were comparatively large and occurred on 

 April 1 1th, August 4th, October 1st, November 24th, and January 13th 

 the last named being caused by the disastrous Italian earthquake of 

 that date. The preliminary tremors of this quake were recorded 

 in Toronto at 7h. 12m. 12s. G.M.T. and continued for one hour and 

 twenty- two minutes. The first waves reached Victoria at 7h. 15m. 

 48s.; the duration of the disturbance was one hour and forty-two 

 minutes. The largest range of motion was 2 • 8 millimetres at Toronto 

 and 2 • millimetres at Victoria. The Director of the Rome Observa- 

 tory, Italy, gives the beginning of this earthquake, recorded at Rome 

 as 6h. 52m. 55s. 



We continue to send duplicates of all our seismological tabulations 

 to a number of Central Seismological Institutions throughout the 

 world, this data being used conjointly with that from other countries 

 for the purpose of seismic investigation. 



Early in the year the seismological equipment of the new Observa- 

 tory at Victoria was augmented by a vertical Seismograph recording 

 on smoked paper. Other instruments ordered from Germany have 

 not been received. 



More recently a small observatory for Meteorological work and 

 a time service was completed and occupied in St. John, N.B., and here 

 again the work will in future be carried on under most favourable 

 conditions. 



Magnetic observations. — The photographic magnetic instruments 

 have been kept in continuous operation throughout the year. In 

 August 1914 a photographic Vertical Force Instrument was added 

 to the equipment so that now we have a complete record of all the 

 magnetic elements. The zeros of these recording instruments are 



Proc. 1915—6 



