Public domain
Wool replaces rubber. Wool felt, a proven substitute for rubber in washers and gaskets for machinery, may be "tailored" as shown above to meet tolerances of a few thousands of an inch for a variety of sizes and shapes. Physical properties such as resiliency, tensile strength, etc., are "made to orde
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Credit lineWool replaces rubber. Wool felt, a proven substitute for rubber in washers and gaskets for machinery, may be "tailored" as shown above to meet tolerances of a few thousands of an inch for a variety of. 1943-01-01. Smith, Roger, United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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