If I'm reading a paper map how do I determine what projection was used to draw the map if such information is not explicitly labelled on the document?
Online it is easy to find resources (for example, Wikipedia or GIS Wiki) that describe and classify the various projections in use. However, as a non-expert map user I find it difficult to use the construction details in reverse, to determine what projection has been used to draw a particular map. I thought perhaps there might be a flow chart or other classification process that could help a map user determine the projection in use?
For example, at my local library and archives there is a copy of a map lithograph from the Dominion Lands Office (Canada) dated 1878. The map has curved parallels and meridians that are wider at the bottom than the top (the top being closer to the pole in this case). I think this makes the map a conical projection, but I'm not sure. And, if that is correct I am interested in learning if it is possible to classify the projection more precisely (e.g. Lambert conformal).
I have made a partial scan of this 1878 map (it is too large to scan the whole thing with the equipment I have available) in case that helps anyone answer my question.