first edition Softcover
1951 · New London
by n/a
New London: U.S. Naval Submarine Base, 1951. First edition. Softcover. g+ to vg. Quarto. 2pp. Original illustrated cream wraps with brown ruling and lettering on cover. A simple demonstration of the colors which are confused by persons with defective color vision conducted by the Medical Research Laboratory of the U. S. Naval Submarine Base, New London. Contains adjustable Iso-Color Diagram showing the color confusions and color differentiations which characterize the three types of color defectiveness and instructions. Wraps with light wear along edges. Minor offsetting from adjustable diagram to opposite page. Pencil mark relating to Franklin Institute on back cover. Wraps and in overall good+, diagram in very good condition.
(Inventory #: 40496)