Look at Fig. 13. Here I am making a rough (very rough) sketch of a small toy locomotive. To draw the side elevation at (1 ) I have placed the loco in front of me and drawn what I saw. To obtain the view of the smoke-box front elevation (which some would call the end elevation) I turn the toy through 90 degrees and again draw what I see at (2). This is the same view that I would have seen had the loco backed round a 90-de-gree curve, and it is in the same relative position. In turning the toy round to see the
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