The Hamann Delta mechanical calculator

The Hamann Delta is an electrically driven mechanical calculator made between 1935 and 1939. It uses the same latched gear mechanism as the Hamann Manus, but has a full keyboard.
For more information about this and other machines in my collection, please visit my website:
www.jaapsch.net/mechcalc/
0:00 Introduction, History
0:45 Addition
1:40 Automatic division
3:44 Outro

[@GrumpyTim]

How incredibly handy that they provide the hand crank, much better than letting it smash itself to pieces doing the automatic division if it's not running quite a smoothly as it once did. A lovely machine to see Jaap.

[@ChrisStaecker]

love the optional crank! I wish those were more popular.

[@stephenfreeborn]

Thanks for that video. Cool machine indeed.