Matthias Wehrli
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Mechanical Calculators:
A long time before modern electronical calculators there were many different mechanical ones. Some of them are well known as the abacus or the slide rule which we all used at school. So let me just give you a short overview on some very special calculators:
Curta:
| Model I |
Feature |
Model II |
| 8 x 6 x 11 |
Keyboard |
11 x 8 x 15 |
| 8 columns |
Result Dial |
11 columns |
| 11 places |
Add / Multiply to |
15 places |
| 6 places |
Divide to |
8 places |
| 53 mm |
Diameter |
65 mm |
| 85 mm |
Height |
90 mm |
| 230 g |
Weight |
360 g |
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| Both models were mathematically identical, the only difference was the number of colums and places. If you want to try a Flash6 emulator of a Curta, try this. |
Circular slide rule:
| There were many different manufactories that produced this type of slide rule. The great advantage of them: They were small and looked much more nicer. |
Circular slide tubes:
You will find two manufactories that produced different slide tubes. This one is from Loga, made in Switzerland.
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