This full-keyboard, electric non-printing pinwheel calculating machine has eight columns of black and white color-coded plastic keys, with a red clearance key at the bottom of each column. The ...

THE news has recently been released of a major advance in the development of equipment for extensive numerical calculations, in the successful completion of a large calculating machine based on the ...

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 manually operated, non-printing ...