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White ring in first curta cases?

 
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eteson



Joined: 28 Jun 2017
Posts: 23

PostPosted: Sun Aug 13, 2017 1:40 am    Post subject: White ring in first curta cases? Reply with quote

I am cleaning an servicing sn 3198. The case does not have white ring. I have seen that very early curtas came without this ring if I am right... Does someone know when they started to put it?
Thanks!
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eteson



Joined: 28 Jun 2017
Posts: 23

PostPosted: Sun Aug 13, 2017 5:47 pm    Post subject: Reply with quote

This is the Curta I put a ring but I would like to know if I need to remove it. It belonged to Peter Fraiser, applied mathematician and a very interesting guy.




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murff



Joined: 27 Oct 2009
Posts: 592
Location: Switzerland

PostPosted: Thu Aug 17, 2017 6:48 pm    Post subject: Reply with quote

The case was designed to use with an O-ring, I think. So it's likely that the oldest known Curtas simply lost the rings (with a higher possibility than younger ones...).

But we will never solve all the Curta secrets Smile
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