XC ROYAL SOCIETY OF CANADA 



keep both men employed. Besides completing the spectrograph and the 

 travelling wire micrometer mentioned in the last abstract, a polarizing 

 photometer, for the determination of stellar magnitudes has been con- 

 structed. New cameras have been inade for the spectrograph, and ex- 

 tensive alterations in the transits and chronographs used in longitude 

 work have been completed, to say nothing of the numerous smaller pieces 

 of work which cannot be detailed here. The workshop has been re- 

 moved to a larger and better lighted room in the basement, in which the 

 machine tools are arranged to much better advantage, and many facili- 

 ties for the convenience and rapidity of Avorking have been added. 



Surveys. 



Besides the above, extensive surveys are carried on in connection 

 with the Observatory, and under the control of its Director. These com- 

 prise the International Boundary Sui-veys and the Geodetic Survey of 

 Canada. 



The nature of the work on four sections of the International Boun- 

 dary Line, viz., the 141st meridian of west longitude, the Canada- 

 AJaska Boundary under the Award of 1903, the 49th parallel, and the 

 line from the Eichelieu Eiver to the St. Croix, was described in last 

 yearns statement. 



The point of intersection of the 141st meridian with the Yukon 

 Eiver having been determined, a careful determination of the direction 

 of the meridian at that point was made, and the line was then prod'uced 

 southward by a joint Canadian and United States surveying party for 

 a distance of about 150 miles. The line is cut out where it passes 

 through woods. Monuments will be placed at short intervals on high 

 points, so that each v/ill be visible from the next. The operations of 

 the survey comprise a triangulation following the meridian, and a topo- 

 graphic survey of the immediate neighbourhood of the line on both sides 

 of it. 



Operations on the Award boundary line are being continued as de- 

 scribed last year. An important part of the work consists of a topo- 

 graphic survey, in which the photographic method is used, of the region 

 referred to in the agreement of 1905, supplementary to the Award, where 

 definition of the line depends upon the selection, after survey of suitable 

 mountain peaks. The crossing by the line of the Alsek Biver, presents 

 a somewhat similar problem. 



The re-monumenting of the 49th parallel from the Rocky Moun- 

 tains to the Gulf of Geo'-o-ia has been completed, and nothing remains 



