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 Serial/Series Title: War Department technical manual
 Collection: World War Two Collection
75-mm howitzer materiel.
This is a World War II-era technical manual for the 75mm Howitzer. It contains information on use, maintenance, assembly, and other aspects of this weapon.
Aerial photography.
A training manual designed to teach aerial photography for military purposes.
Aircraft engines.
Discusses the principles, classification, description, and construction of internal combustion engines used in military aircraft. Includes instructions for storage of engines.
Aircraft hardware and materials.
Describes the types of "materials and hardware used in aircraft construction and repair."
Aircraft induction, fuel and oil systems.
Describes aircraft engine systems, fuels, and lubricants.
Airship aerodynamics.
"This manual is designed as a text for the instruction of airship student pilots .... to give the knowledge of aerodynamics essential to the operation of [lighter than air aircraft]."(Page 2.)
Grinding machines
This report provides the definition of grinding and discusses different processes, types, and operations of grinding.
Heat treating and inspection of metals
This report discusses these topics: I. Principles of heat treating -- II. Heat-treating equipment -- III. General heat treatment of steel -- IV. Specific heat treatments for aircraft steels -- V. General heat treatment of aluminum alloys -- VII. Hardness testing -- VIII. Magnaflux inspection.
A guide to the operation and maintenance of lathes for general shop work.
Radiotelephone procedure
"The purpose of this manual is to acquaint radio operators and pilots of the Army Air Forces with radiotelephone procedure"
Theory of ballooning.
A general guide to piloting a free balloon.