Production. Aircraft. Samples for microscope inspection--a lowly rivet, a screw, an extruded part--prepared by a test engineer in a large Western aircraft plant. Samples are embedded in bakelite, polished to mirror finish, then etched with acid to bring out the grain. A faulty grain structure, as revealed through the microscope, will show up low-grade material or faulty processing methods in the manufacture of the part
Summary
Public domain photograph of California in 1930s, free to use, no copyright restrictions image - Picryl description
Tags
Date
01/01/1942
Contributors
Bransby, David, photographer
United States. Office of War Information.
Location
Burbank (Los Angeles County, Calif.), 34.18083, -118.30889
Source
Library of Congress
Copyright info
Public Domain