Bohn Contex - 10 Vintage Calculator Mechanical Adding Machine Very Old
Item History & Price
| Reference Number: Avaluer:48260890 | Maker: Bohn |
This is a Bohn Contex-10 Vintage Calculator in pretty good condition and it works. It comes with instructions, a blue cover and a leather case. It works well when doing adding, subtracting and multiplication. I ran into a few hiccups when doing division with large numbers, but it divides numbers under a thousand more accurately. The quick shift key some times sticks a little and has to be hit a second time to get red lever to slide to the left during division.
Note in regards t...o division. I did a few tests and division worked on numbers below 1000, but when using larger numbers it gives a slightly inaccurate response. For example, I divided 567 by 122 and got 4.6 (correct), I divided 778 by 32 and got 24.3 (correct) and I divided 898 by 4 and got 224.5 (correct). But then when I divided 89268 by 258, I got 356, which is wrong, it should have been 346. So the calculation is off on large numbers, but still somewhat close.
The rubber feet on this have dry rotted and mostly fallen off. The brown leather case is fairly beat.
This belonged to my uncle. He put labels on it to help him remember how to do certain complicated calculations (such as division).
It looks to be from the '50s or early '60s. It measures about 10" long and 7.5" wide.
One of these sold on Ebay for around $175 in mid November.
Note in regards t...o division. I did a few tests and division worked on numbers below 1000, but when using larger numbers it gives a slightly inaccurate response. For example, I divided 567 by 122 and got 4.6 (correct), I divided 778 by 32 and got 24.3 (correct) and I divided 898 by 4 and got 224.5 (correct). But then when I divided 89268 by 258, I got 356, which is wrong, it should have been 346. So the calculation is off on large numbers, but still somewhat close.
The rubber feet on this have dry rotted and mostly fallen off. The brown leather case is fairly beat.
This belonged to my uncle. He put labels on it to help him remember how to do certain complicated calculations (such as division).
It looks to be from the '50s or early '60s. It measures about 10" long and 7.5" wide.
One of these sold on Ebay for around $175 in mid November.
