IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This full keyboard manually operated ...

This small stylus-operated non-printing adding machine has seven chains in parallel columns. The links visible in each column are numbered from 1 to 9. A stylus is placed in a link of the chain and ...

Which adding machines for your office are best? While adding machines, sometimes referred to as printing calculators, may seem outdated and obsolete, they remain indispensable for offices all over the ...

An early adding machine, c. 1890, invented by William Seward Burroughs, grandfather of the beat writer. National Museum of American History Today every phone is a calculator, but in the late 1800s, ...