Indentations made by typing on lead tape. Lead scales for inclusion in x-radiographs as length and position references created by repeatedly imprinting character like upper-case I, L, or V, or lower-case L into lead tape with typewriter. Character pitch of typewriter serves as length reference for scale. Thinning of tape caused by impacts of type shows up dark in radiograph.
Lead Scales for X-Radiographs
NASA Tech Briefs ; 11 , 9
1987-10-01
Miscellaneous
No indication
English
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