> On Jul 29, 2019, at 10:36 AM, J Forbes <[email protected]> wrote:
> 
> Interesting....I have a mechanical Comptometer (it's about 100 years old), it 
> has a similar keyboard layout, and little wheels to display the numbers. Mine 
> will add, and do one's compliment subtraction, but none of that silly 
> multiply or divide stuff. Progress!

My late friend Brooke Boering was something of an expert on comptometers:

https://web.archive.org/web/20170325135139/http://www2.cruzio.com/~vagabond/ComptHome.html


Some video:

https://www.youtube.com/watch?v=aDDAbKURGZI


Terry Bowman, KA4HJH
"The Mac Doctor"

"I've seen things you people wouldn't believe: attack ships on fire off the 
shoulder of Orion... beams...in the dark in the Tannhauser Gate. All those 
moments will be lost in time...like tears in the rain." — Roy Batty, Blade 
Runner

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