1) Mechanical calculator
Found on
https://www.crosswordclues.com/clue/arithmaurel
First patented in France by Timoleon Maurel, in 1842, the Arithmaurel was a mechanical calculator that had a very intuitive user interface, especially for multiplying and dividing numbers because the result was displayed as soon as the operands were entered. It received a gold medal at the French national show in Paris in 1849. Unfortunately its c...
Found on
http://en.wikipedia.org/wiki/Arithmaurel
No exact match found.
