Post AIl39c36pWrO7daSNE by kyle@social.librem.one
 (DIR) More posts by kyle@social.librem.one
 (DIR) Post #AIl39c36pWrO7daSNE by kyle@social.librem.one
       2022-04-24T00:47:21Z
       
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       This evening I'm cleaning, repairing and refurbishing a Comptometer model 3D11 from the 1950s. This was the last Comptometer the company made and has its final speed and accuracy improvements before the world moved to electronic calculators.
       
 (DIR) Post #AIlUOyTAS4NalPKDY0 by sbeebe@social.coop
       2022-04-24T05:52:38Z
       
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       @kyle Neat. Where or how is the sum displayed?
       
 (DIR) Post #AImFlThNibOjptCpsm by kyle@social.librem.one
       2022-04-24T14:43:21Z
       
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       @sbeebe The register is in the front of the device lined up with each column of keys. In the picture everything is currently blank but once you depress a key it would add to the corresponding register. I demo a similar (but a few decades older) Comptometer in this thread.https://social.librem.one/@kyle/107113386138173691Once I finish cleaning and repairing this one I'll follow up with a thread demoing and explaining it.
       
 (DIR) Post #AImUcU94BgYJvXKEmO by sbeebe@social.coop
       2022-04-24T17:29:48Z
       
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       @kyle Fantastic! Thank you for sharing. What a cool machine. It seems like they are peak mechanical prowess.
       
 (DIR) Post #AInCqffoWDgXibDXJw by kyle@social.librem.one
       2022-04-25T01:45:23Z
       
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       @sbeebe Yes I would say that Comptometer and the Curta are great examples of peak mechanical calculators, with a Marchant Silent Speed being another if you include electrically-driven ones.
       
 (DIR) Post #AIqvlFDWXA53d4eQsa by kyle@social.librem.one
       2022-04-26T20:52:46Z
       
       1 likes, 1 repeats
       
       So I made some progress with refurbishing the Comptometer this weekend. I freed up many stuck registers, but that revealed an issue with the carry mechanism on a few digits I will have to investigate further.
       
 (DIR) Post #AItFMBZZKjlAUCD8YC by Konqi@mastodon.social
       2022-04-27T23:41:46Z
       
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       @kyle impressive, so much mechanical complexity at glance, seeing that many components together is a lot more entertaining than a circuit board.