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open access

Grinding machines

Description: This report provides the definition of grinding and discusses different processes, types, and operations of grinding.
Date: November 26, 1940
Creator: United States. Army. Air Corps.
open access

Lathes

Description: A guide to the operation and maintenance of lathes for general shop work.
Date: November 29, 1940
Creator: United States. Army. Air Corps.
open access

Theory of ballooning.

Description: A general guide to piloting a free balloon.
Date: April 25, 1940
Creator: United States. War Department.
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