Old Calculator Competition - Hamann, Diehl, Odhner

My two electric calculators competing on 789 divided by 123 while I try to keep pace on the hand-cranked Odhner.
The Hamann is trying very hard judged by the insane noise it makes, but the Diehl not only is the smoother running, more "modern" machine with its 1960s' ugliness, it also uses a different approach for division: By saving the corrective cycle after the underflow and just adding at the next digit (I learnt that from another Youtube video), it finally wins the competition.

Note that the Diehl only delivers 7 digits while the Hamann does 8, but when the Diehl is finished, the Hamann is still working on its 6th digit.

Next to the big Diehl (pun intended), the Hamann looks rather modest.

Bonus: When multiplying, the Hamann is actually faster in this case, if you don't count the time needed to enter the 2nd factor into the revolution counter. On the Diehl, multiplication is semi-automatic, and you have to enter the 2nd factor from right to left on the multiplication keys and wait for the carriage jumping to the next position after each digit.

Both machines shorten multiplication by subtracting instead of adding for values 6 to 9.

Nice video and very very interesting idea for the video, thanks. Next time you may divide 4 by 2 :) I bet that you win, the second will be Odhner (just stop calculating at zero remainder), Hamann will be the third and Diehl will be the last.

[Xicohtencatl_Xayacate]

The smallest adding machine is the cutest one. ❤

And it doesn't require power supply, like the one two machines. 🎉

I have seen Odhner-like machines made in the USSR on Etsy. I hope being able to afford one some day. 😊

Greetings from Mexico. 🇲🇽

[billogle]

What a useless comparison, the Odhner's design comes from t late 1800, it also had "short cut" multiplication if you knew how to use a point of interest all the "modern machines" used a variation og Wigot Odhners Pin Wheel system. Wilgot was a wonderful engineer, alas a poor businessman, he let his patents expire, others were quick to take advantage