The apron : its traditions, history and secret significances (1914)
Higgins, Frank C. (Francis Carlos), b. 1867 · New York : Author · leaf 22
orm a per-fect Pyramid, shaped like c-e-d, on a square base. If on theother hand we perform tIn-same operation on a reducinginstead of an increasing scalethe vertical axis of c-e-d willbecome the side of a triangle,f-c-h, which will be equal to twoPythagorean triangles placed back to back. This… … Pig-. 10.
Freemasonry
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