Recherche dans la collection - [St. Lawrence River at Lake St. Francis showing soundings.] David Thompson, Civil Engineer; Henry G. Thompson, Assistant & Sculptr. [cartographic material]

Shown is a section of the St. Lawrence at the lower end of Lake St. Francis, between Grosse Pointe and the entrance to the South Channel. Soundings are marked, and information on currents is given. The map bears the stamps "Board of Works, Office Document"; "Beauharnois Canal 70, Case B 154"; and "31". Manuscript additions to the map describe projected engineering works in the River. The date "November 1839" appears as a manuscript addition ot the right of the names of the authors. A late copy of the map bears the imprint "Copied for the Board of Works from a survey made by David Thompson, Civil Engineer, in November 1839".
For copy of this map see H3/310/St. Francis (L.)/1839

Scale 1:7,200

The microfiche version is NMC19283