APPENDIX B LXXXIX 



From the excliange bulletins received a good many earthquakes 

 were located in their geographical co-ordinates by means of our stereo- 

 graphic tables. 



An earthquake was recorded and felt in Ottawa on April 28 last, 

 at about 7h. 30m. in the evening. It was felt on both sides of the St. 

 Lawrence from Montreal to Brockville, covering an area of approxi- 

 mately 25,000 sq. miles. 



In connection with the International investigation of the deforma- 

 tion of the earth by the moon, a subterranean vault was built at Winnipeg. 

 Winnipeg was chosen by the International Seismological Association 

 as one of the four stations to investigate a certain anomaly in the results 

 so far obtained, because it lies about midway between the Atlantic and 

 Pacific, whereby it is expected that the effect of any possible deformation 

 by the ocean tides will be there avoided. For the further study of micro- 

 seisms an undagraph was obtained, which will be installed at Chebucto 

 Head, outside of Halifax Harbour, and exposed to the broad waters 

 of the Atlantic. It will be the first instrument so placed; the first 

 constructed wave-counter was set up at Tynemouth, in more or less 

 sheltered waters. 



The magnetic survey of Canada was continued and the three mag- 

 netic elements, declination, dip and intensity observed at 60 stations 

 in Quebec, New Brunswick and Nova Scotia. 



Boundary Surveys. — These have been continued in various parts of 

 Canada. The 141st meridian, between Yukon and Alaska was com- 

 pleted and monumented northward to the Arctic ocean. The area lying 

 along the boundary line between the Nunatak glacier and the Alsek 

 river was photographed. From the photographs a topographic map is 

 made. A triangulation was carried down Portland Canal southward 

 65 miles, and monuments were planted. The survey and monumenting 

 of the section between the Northwest Angle and Lake Superior was 

 begun at the Northwest Angle by carrying out a triangulation and 

 topographical work as far as Comfield and Big Islands. Along the 

 Quebec-Maine boundary, some 48 miles were run and re-monumented. 

 Precise levels were taken, and the topography, a half-mile on each side, 

 obtained. The survey of the St. Croix river was completed, and some 

 triangulation and traverse connected therewith carried out. 



Geodetic Survey. — Triangulation was carried on in Quebec to the 

 Maine Boundary; in southwestern Ontario, connecting with the U. S. 

 Lake survey in the vicinity of Lake St. Clair; in the neighbourhood 

 of Belleville; about Port Arthur, eventually to connect with the inter- 

 national boundary survey at Pigeon river; and in British Columbia 

 between Vancouver Island and the main land. A number of triangles 



