Uploaded January 2018 | Updated September 2026, 4 minutes ago

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Here I demonstrate how to use a Curta Calculator, Type I. I also show some interesting paper items relating to the Curta, including a letter about and drawing of two Curtas joined together to form a single calculator.

For more information about the Curta and other mechanical calvulators in my collection, visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:16 History
1:14 Description
1:42 Inputting
2:00 Addition
2:22 Multiplication
2:58 Subtraction
3:38 Clearing
4:25 Division
6:28 Storage
6:58 Table of square roots
7:32 Price list
8:06 Advertising leaflet
8:52 Letters
9:36 Double Curta design
11:17 Outro