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Aviation History
1939
1939 - 0152.PDF
14- FLIGHT. ADVERTISEMENTS. JANUARY 19, 1939. ...ONE OF THE RIGID TESTS Lockheed sublets forg.ngs, castings, welded un.ts and \ mg fm£ mmm Q|JflUTY other metal parts to X-ray inspection in addition to ex- \ haustive tensile and compressive tests. • Primary stress ^ parts, regardless of size, are 100 per cent X-rayed by the advanced Triplett & Barton method. Negatives are inspected by metallurgists trained in the interpretation of radiographs. • The infallible scrutiny of the eye that sees through metal gives complete assurance that only perfect parts are used in Lockheed airplanes. LOCKHEED AIRCRAFT CORPORATION, BURBANK, CALIF., U.S.A. Representatives Throughout the World
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