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Silent Curta Type II SN 507157

 
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Sebastian



Joined: 11 May 2014
Posts: 42
Location: Germany
PostPosted: Sun Feb 01, 2015 9:24 pm    Post subject: Silent Curta Type II SN 507157 Reply with quote
Hello,

I own six Curtas now - one of those calculators is special, because it does not make this typical sound. It has an additional ring (spring), which lifts the catch (that prevents from turning in the wrong direction) when turning the crank handle.
Does anyone of you have further information on this "silent" Curta?
How many were produced?
I only know of one other silent Curta which is a Type I.

Regards

Sebastian

https://www.flickr.com/photos/131105513@N02/16404073206
_________________
Type I
5023
8121
11140
22146
22961
22983
26713
66561
80151
Type II
500438
502852
507157
509135
555001
555476
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stenella



Joined: 03 Jun 2008
Posts: 47
Location: Antwerp, Belgium
PostPosted: Thu Apr 16, 2015 10:15 pm    Post subject: Reply with quote
Hi Sebastian,

I don't know much about them - one was sold on ebay not so long ago. The question I keep asking myself is - if a spring holds back the ratchet pawl, what prevents the machine from turning backwards ?

Thanks,

Cris
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Sebastian



Joined: 11 May 2014
Posts: 42
Location: Germany
PostPosted: Wed Aug 19, 2015 9:33 pm    Post subject: Reply with quote
Hi Cris,

as soon as you try to turn the crank backwards, this ring (spring) also turns backwards a bid and lowers the catch again…

Sebastian
_________________
Type I
5023
8121
11140
22146
22961
22983
26713
66561
80151
Type II
500438
502852
507157
509135
555001
555476
Back to top
View user's profile Send private message
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