The Meridian Transit used in Canada's Northern Boundary Survey. JRASC 48,129 [2]
Links:
[1] http://www.rasc.ca/category/image-galleries/national-archives/archives-1950s-jrasc-0
[2] http://articles.adsabs.harvard.edu/cgi-bin/nph-journal_query?volume=48&plate_select=NO&page=129&plate=&cover=&journal=JRASC