An Avery (Birmingham, England) ball hardness testing machine for Brinell tests. This photograph is from a large selection of mainly unattributed engineering illustrations and printed photos which were originally published in 1936. The sizes and quality of the originals vary quite widely.

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Size: 3658px × 8000px
Location: Birmingham, England
Photo credit: © Preserving Printed Matter Matters / Alamy / Afripics
License: Licensed
Model Released: No

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