George Grant’s Difference Engine: How it Worked The difference machine of Grant was approximately 2.5 meters long and 1.5 meters high, weighing about 900 kg.

Difference Engine A numerical table is a tool designed to save the time and labor of those engaged in computing work. The oldest tables which are preserved, were compiled in Babylon in the period ...

THE DIFFERENCE ENGINE: Charles Babbage and the Quest to Build the First Computer Doron Swade, Charles Babbage, . . Viking, $24.95 (352pp) ISBN 978-0-670-91020-5 ...

When the Scheutz difference engine was shipped to the Dudley Observatory in Albany, New York, in 1857, all the instructions provided for its use were this set of drawings and a letter explaining the ...