I have a map of Nova Scotia published by the Department of the Interior Canada in 1924 which I would like to georeference.
The map has a graticule labeled with latitude and longitude. According to a note on the map, the prime meridian is Greenwich. It's not a Conformal projections since lat/long do not meet perpendicular.
I have read that the Department of the Interior Canada was using a Polyconic projection before replaced with the 1932 Lambert Conformal Conics. (https://www.asprs.org/a/resources/grids/12-97-canada.pdf)
Were there other projections used in 1924? What projection and datum is most likely used for a map of Nova Scotia in 1924?