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 ten-key printing electric adding ...

For most of human history, doing arithmetic, while sometimes aided by devices like the abacus or adders, was fundamentally an act of human intelligence. In the 17th and 18th century, a few natural ...

An adding machine can be as simple as a piece of cord with which to tie a series of knots. At the other end of the spectrum are modern electronic gizmos that can accurately add up dizzying numbers at ...