Ordnance maintenance : prismatic compass, M1918. (open access)

Ordnance maintenance : prismatic compass, M1918.

Describes the Prismatic Compass, M1918 and provides instructions for its operation, maintenance, and its functions in relation to various types of field artillery.
Date: July 17, 1941
Creator: United States. War Department.
System: The UNT Digital Library
Orientation (open access)

Orientation

Provides a text and reference book covering the principles of orientation. Orientation is defined as "the accurate location of datum points and the establishment of lines of known length and direction".
Date: July 15, 1941
Creator: United States. War Department.
System: The UNT Digital Library
Aerial photography. (open access)

Aerial photography.

A training manual designed to teach aerial photography for military purposes.
Date: July 8, 1941
Creator: United States. War Department.
System: The UNT Digital Library