diam. 8-5/8 in.
Circular metal and plastic German mechanical, graphical solution to the astronomical triangle; 2 projections, 2 reading microscopes, red light for illumination; directions in German on 3 plaques: how to set, how to calculate, and one other; transformer on electrical cord. Taken from a German submarine at the close of WW II. Instrument is packed in a wooden case marked, "ARG 1".