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| Date | 2011-08-07 |
| Location |  |
| Message | i got one of those sliding adding machines when i was young, and after finding your you tube vid i finally learned how to use the thing - after 35 years. as for the slide ruler on the other side, i still cant figure it out. this site is so cool |
| Date | 2011-08-03 |
| Location |  |
| Message | excellent web.thank you.Sory.nou speek english. |
| Date | 2011-07-09 |
| Location | |
| Message | this is a really great collection. thanks for sharing it  |
Private Message added 2011-07-07 |
| Date | 2011-07-07 |
| Location |  |
| Message | I've always been fascinated by mechanical calculators, so 'thanks' for putting up this site. The Curta video was excellent. |
| Date | 2011-05-25 |
| Location | |
| Message | I have one that says American Original Odhner. It is black and the serial number is 67192 It was made in Gotenborg and it is in the original A E Meeks carrying case. Any info on the value would greatly be appreciated. |
| Date | 2011-05-05 |
| Location | |
| Message | I enjoyed your site. I have a Web page for some non-standard virtual slide rules at mathed.org/slide.html. There are slide rules for finding the third side of a right triangle and for adding velocities relativistically. |
| Date | 2011-04-16 |
| Location | |
| Message | Hi! I have an Allied Mfg. Co. "Add-O-Matic" that was given to me by my father. This is the ONLY site on the web that has even a little info about it! Anyone have any information on this cool little machine? Regards! |
| Date | 2011-04-07 |
| Location | |
| Message | Fixing to ping this site a bunch for tonights #HSMath tweet chat on Twitter. This site is awesome! Here's the details of the tweet chat can be found on the site MathFour.com and look under #HSMath |
| Date | 2011-03-22 |
| Location |  |
| Message | I worked for the Underwood Co, in Brighton Sussex for many years on the Sundstrand class C and D and the Elliot Fisher machines, had a great time, sorry its all gone. |
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