Grant’s difference engine was invented in 1876 by George Grant. It was a calculating machine and was invented as a way to advance the current calculating machine technology. It used the latest design ...

This lever-set non-printing manually operated connection pawl calculating machine has an open iron frame painted black, with steel and brass parts and paper labels. Five pins at the front of 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. In the early 1890s, as the Columbian ...