Adams Idiot's Delight Checkerboard Puzzle

S. Adams Co. Neptune, NJ., Copyright 1958.
(6" by 4" cardboard package and six 3.5 by 2.5 inch puzzles,
the checkerboard and five others, including Magic T;
shown on page 167 of the Adams Co. History book;
shown on page 21 of the Haubrich book.
which presents the unique solution shown above)