Boxwood slide-rule belonging to Bryan Donkin Jr
Boxwood slide-rule belonging to Bryan Donkin Jr
Size: 5339px × 3552px
Photo credit: © IMechE / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: &, belonging, boxwood, bryan, c1890s, donkin, engineering, history, industrial, jr, machinery, measurement, mechanical, rulers, science, slide-rule
