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| Date | 2010-09-01 |
| Location |  |
| Message | As somebody who graduated engineering school with a slide rule, and then converted to mechanical calculators, I'm still fascinated by mechanical calculators. What makes them extremely desirable is the fact that today they are totally useless. After all, things that are strictly useful can be boring! |
| Date | 2010-08-26 |
| Location |  |
| Message | Great site! But what I am really looking for is an introduction to the Mayan "NEPOHUALTZITZIN". Has anyone informations about this pre-Colombian abacus? |
| Date | 2010-07-13 |
| Location |  |
| Message | Whatcha! As an Underwood employee in Birmingham England I used to repair and service these machines in the 1960's. On the whole the machines were reliable, and the most common problem was the very fine spring loaded number printing system. They were taken over by Olivetti in the late 60's |
| Date | 2010-07-12 |
| Location |  |
| Message |  I have an add-o-matic from the later years as you said. It looks just like the picture you have. |
| Date | 2010-07-09 |
| Location | |
| Message | Very entertaining videos. I learned to use the abacus when I was little but gave that up when I got older. Now that I have a two year old, I'm thinking of introducing the abacus to him in a couple of years. Hopefully this website will still be here and I can show him the videos! |
| Date | 2010-07-09 |
| Location | |
| Message | Very entertaining videos. I learned to use the abacus when I was little but gave that up when I got older. Now that I have a two year old, I'm thinking of introducing the abacus to him in a couple of years. Hopefully this website will still be here and I can show him the videos! |
| Date | 2010-06-07 |
| Location | |
| Message | Hello your site is great. I just picked up a Monroe Calculating Machine Company Model K and I was wondering if any one knew where I could find a manual and how much it worth. Thanks great site!! |
| Date | 2010-05-18 |
| Location |  |
| Message | this is really entertaining . I hope you can add more videos about how to use an abacus for various other advanced operations like , multiplications , division, finding square root. or may be you can give a video showing how you use the different abacus you have shown using diagrams. |
| Date | 2010-05-01 |
| Location | |
| Message | I have one of these Tasco pocket Arithmometers and, thanks to your web site, I can now see how it operates. I was going to throw it out, but it I guess I will keep it and play around with it. |
| Date | 2010-04-24 |
| Location | |
| Message | Awesome insight into arithmetic methods that are long gone! Pretty cool stuff!  |
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