Stereoscope
Manufactured by Q-O-S Corporation, New York for the U.S. Army Corp of Engineers. Although originally designed for military reconnaissance work, this type of instrument was used for map reading of aerial photographs up to 8”.
Object ID: USGS-000235... Location: USA
Army National Guard, Cedar Rapids, IA
Army National Guard assisting with the flood near 12th Ave. and M Street... Location: Cedar Rapids, IA, USA