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TRIANGULATION OF TRANSITION PIECES
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spaces. If they fail to do so, an error in drawing has been made which should be corrected before proceeding further. The order of development must now be decided upon. The
Figs. 278-283.—Transition between a Square pipe and the second Piece of an Elbow.
triangles naturally divide into two groups, Group A being those triangles having their base lines starting from point A, and Group B starting from point B. Besides these triangles there is a start-
