APPENDIX B LXXIX 
of Basswood lake where a base has been measured by the U. S. Sur- 
veyors. It is the intention to establish a Laplace station by wireless 
telegraph in the neighbourhood of this base. 
THE TRIANGULATION, ETC. 
During the season of 1915, three field parties were engaged in 
extending primary triangulation in connection with the Geodetic 
Survey of Canada; one party was employed observing horizontal 
directions in the London district with a 12-inch altazimuth instrument 
reading to one second of arc. Another party measured two base 
lines, one in the vicinity of Collingwood and the other a short distance 
west of London, Ontario, both of which are connected with the primary 
triangulation by base nets. A third party conducted a reconnais- 
sance survey across the State of Maine, having for its object a direct 
connection between the Canadian primary triangulation in the south- 
eastern part of the province of Quebec with the primary triangulation 
in the southwestern portion of the province of New Brunswick. 
All of the work of the season of 1915 was most satisfactory. 
A number of triangles were closed with an average closing error 
of considerably less than one second of arc. It was also noted that 
the closure of the circle—when observing horizontal directions— 
averaged less than one-quarter of a second. 
Precise levelling was carried on during the season of 1915 by six 
parties, one of which operated in New Brunswick and Quebec, two 
in Ontario, one in Alberta, one in British Columbia, and one in Alberta 
and British Columbia. Over 1,800 miles of levelling was accomplished 
during the season and the net of precise levels considerable strength- 
ened by the closure of several additional circuits. 
A transcontinental line of levels—extending from Halifax to 
Vancouver—has now been almost completed; only two unlevelled 
sections, of less than 300 miles each, now remaining to complete 
such a line. It is proposed during the coming season to make a vig- 
orous effort to accomplish these connections. 
Requests for the elevations resulting from precise levelling have 
been received in considerable number from engineering and surveying 
organizations and the number of such inquiries in constantly becoming 
greater as the work becomes more widely known to the public. 
