Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 37
FIG. 40 36 Prob. 41. Transition Piece, Fig. 41. Scale, 3=l-0.See second method of finding the true length of line, page 10. … Prob. 42. Transition Piece with off-set, Fig. 42. Scale,
Projection
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
