Hello Everbody!

Apart from my two Curtas, I have a number (nearly 100, if you're asking!) of other mechanical calculators, comptometers and adding machines. In an idle moment I caught myself wondering which of my other machines represent the nearest equivalents of the Curtas.

The Curta 1 has an 8 digit Setting Register (with Control Register), 11 digit Result Register, and 6 digit Revolution Counter (with tens carry and manual direction selection).

In practice it's difficult finding a full-size machine with exactly these attributes - either they have a back-transfer facility (which disqualifies them from the comparison), or if they don't, the revolution counter doesn't carry tens (which also disqualifies them); or the counter direction is set automatically.

The nearest equivalent machine I have to the Curta Type 1 is a Triumphator Model KN, made in East Germany in about 1960. It has a 7 digit Setting Register (without Control Register), 11 digit Result Register, and 6 digit Revolution Counter (with tens carry and manual direction selection). So the only difference in capability is actually in the Curta's favour - one more digit in the Setting Register, and the presence of a Control Register.

Here's a photo of the Curta Type 1 and the Triumphator Model KN:



Now for the Type 2. The Curta Type 2 differs from the Type 1 only in that the capacity is greater; the Setting Register has 11 digits, the Result Register has 15 digits, and the Revolution Counter has 8 digits. Again, I had difficulty finding a full-size machine with similar capacity, but lacking the back transfer and auto-reverse capabilities.

I managed to find one full-size calculator in my collection with the same capabilities but slightly different register capacities. This is the USA made Marchant Model XL from about 1930, which has a 9 digit Setting Register (with Control Register), 18 digit Result Register, and 9 digit Revolution Counter (with tens carry and manual reverse). So the Marchant has a couple of digits less in the Setting Register, but 3 more in the Result Register and 1 more in the Revolution Counter.

Here's a photo of the Type 2 and the Marchant XL (which has clearly seen better days, but it works just fine!):



I'd be interested to know if there are any closer matches out there!

Thanks for this excellent post ... and pictures!

The only non Curta calculator in our household is the Archimedes of my wife - a model D-16 with a 9/16/9 register combination...

Nice idea for a thread

I have a 10/13/8 and a 8/13/6, although the Alpina can't really be described as 'full sized'.

for a better overview...


[ Curta Type II - the 11 setting registers and the 15 result registers ]

[quote="murff"]for a better overview... :D

[ Curta Type II - the 11 setting registers and the 15 result registers ][/quote]

Alright, murff. Can you share how you took that photo? It's beautiful!

it's described here:

Curta Type 2 360 degree view

Love that pic, murff, cheers

I don't think I have anything with the exact same rather unique capacities as the Curta's - but I will offer these two gems, that are even less useful than a Curta I!





www.crisvandevel.de

[quote="murff"]it's described here:

[b][url=https://curta.org/phpBB2/viewtopic.php?t=326]Curta Type 2 360 degree view[/url][/b][/quote]

You have a very steady hand!

don't forget the Multifix 4-function calculator from Norway - it is very small, too

it has nearly the same size as the Alpina:

You guys make me jealous, I've been concentrating too much on vintage wristwatches these last couple of years and not my Curtas. Very nice Alpina example, that Marchant and the Multifix...they're all fascinating. And that Archimedes!

Just noticed the pictures disappeared in the photobucket fiasco ...
Here they are:





www.crisvandevel.de