APPENDIX E CLIX 



west of Montreal — to Tort Erie via Hamilton, and also from Hamilton 

 to London. The computations are now in progress and are sufficiently 

 advanced to show that the results are of a high order of precision. The 

 work has been carried on hy^ a double line of levels running in forward 

 and backward directions, the forward and backward levelling being in- 

 dependent of each other in every respect, and when possible, performed 

 under different atmospheric conditions. The standard of accuracy 

 adopted requires that the backward levelling shall correspond with the 

 forward levelling within 0.017 V~ M feet; " M " being the distance in 

 miles covered by the section. The dense smoke, so prevalent during the 

 season of 1908 and which interfered so materially with the trigonome- 

 trical work, was found to be an assistance) in precise levelling inasmuch 

 as the unusual steadiness of the atmosphere — no doubt caused by smoke — 

 made the observing of the graduations on the levelling rod much easier 

 than in former seasons. 



Consequent upon a discussion in Parliament, in which was apparent 

 a concurrence of opinion that an accurate survey of the better settled 

 parts of Canada would be of practical benefit, the Government, by Order- 

 in-Council of 20th April last, formally instituted the " Geodetic Survey 

 of Canada," and appointed the writer Superintendent of it. 



