Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 34
the two intermediate pieces, thejoint forms an angle of 15° with the center line of the piece.The angle of the elbow, 90°, is divided into six equal anglesof 15°, formed by the joint between the pieces and the centerline of the piece. For an elbow of any angle, there are asmany angles formed as…
Projection
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
