[NA264-N] N-17-01-20 (1917)
This notebook was used during January and February 1917. One additional notation is from August 1922. The entries, which are all by Edison, relate to research performed for the U.S. Navy during the World War I. The notes indicated as \"entered . . . from small book\"" were copied from Pocket Notebook, PN-16-11-15.2. Included are experiments with electromotographs made with osmium (called \""osmophones\""), along with notes taken from published sources, many dealing with the photosensitivity of various chemicals. Additional entries pertain to reconnaissance methods involving light, sound, and radio waves. There are notes on night photography and night vision, including methods of keeping the pupils of rangefinder users dilated for more sensitive vision. Additional information on these night vision experiments can be found in N-17-02-06.1, Notebooks by Edison and Other Experimenters -- Navy and Wartime Research Experiments. Also included are entries describing experiments with hydrogen gas detectors, methods of positioning guns in trenches, and techniques for disabling the periscopes of enemy submarines, along with speculations about \""molecular vibrations.\"" The cover is marked \""Stragetic\"" [Strategic]. The pages are unnumbered. Approximately 40 pages have been used."