COMPUT_190904_037
Existing comment:
R. C. Archibald’s slide rule, 1900–1908

From the 1890s, scientists and engineers routinely owned slide rules and used them for basic arithmetic. Students wore them on their belts or carried them in their pockets as a symbol of technical expertise. Canadian-born mathematician R. C. Archibald kept this slide rule during his long career at Brown University.
Proposed user comment: