# How can I match the angle of projection from a book illustration?

I have translated the part illustrated below into Solidworks but I haven't been able to match the angle of projection used in the illustration.

How can I identify that angle used in the image, so that I can reproduce the figure as closely as possible?

The drawing is from an old book by Thomas French.

• Can't you take a given dimension (say 1 9/16), measure what the scaled dimension on the page is and use trigonometry? Also, you are assuming that the original image was draw "correctly".
– hazzey
Mar 8 '16 at 17:10
• Your illustration looks like an oblique projection. These were often used to simplify the drawing process, before computer graphics. If that is correct, the view does not correspond to any orthographic projection that gives a "realistic" view of the object (even if you ignore perspective). So you won't be able to reproduce "the exact same view" starting from "correct" 3-D geometry with modern CAD software. You could reproduce it by first distorting the geometry, e.g. by applying a shear transformation to the structure. See en.wikipedia.org/wiki/Oblique_projection Mar 9 '16 at 16:15
• For anyone who's interested in pursuing this, I uploaded the model in STEP and STL here: grabcad.com/library/end-plate-2. Also (@Ricardo), is that one measurement 9/6? It's the only improper fraction in the drawing. Jan 16 '17 at 6:46