XC THE ROYAL SOCIETY OF CANADA 



were closed and wow found to he well within the stantlard of accuracy 

 adopted, viz : the closure of the triangle withia one second of arc. 



A very favorable site for a l)aso-lino, aliout 7 miles long, was chosen 

 near Ladner, B.C. 



On account of the progress made in signal-huiidini;- in the pi-eceding 

 season, but few ncAv ones were built in 1912 



A reconnaissance party occupied the field west of Port Arthur; 

 and four parties were engaged in precise levelling during the summer 

 of 1912, in NeAv Brunswick, Ontario and Saskatchewan; together 

 completing approximately 1,2G0 miles of levels. The standard of accu- 

 racy in levelling is maintained Avithin the limits of .017 ft. multiplied 

 by the squai'c root of the number of miles lun. 



