Curta Calculator manuals (package deal of 3 different prints) For Sale

Package deal of
new, high quality reproductions of

3 different instruction manuals

for the Curta calculator Type I and Type II

in English language

which were originally published by Contina Ltd, Vaduz

The instructions and exercises herein apply to both Curta models.

The two models differ only in the number of figures, which they can handle.

The original editions are out of print since many years.
They are very hard to find and purchase.

The purpose of these manuals is to show you
how to make the best use of your Curta.

This package deal includes following 3 manuals:

(1) Instructions foruse of the CURTA

46 page booklet
It measures approx. 145 by 105 millimetres (6" x 4") in size and
containsdescription and handling of the curta, the four arithmetical operations, some practical applications.

(2) Your CURTA Calculator

double-sided 20 page fold-out manual
It measures approx. (complete open) 20.5 x 11.6 inch (518 x 295 mm)
and contains step by step instructionswith illustrations.

(3) Computing Examples for the CURTA51 page booklet,
It measures approx. 145 by 105 millimetres (6" x 4") in size,
complete both manuals listed here before
and contains following computing examples

• Division by breaking down (subtractive method)
• Division by multiplying by a reciprocal
• The rule of three
• The rule of three in a single calculation (only CURTA Model II).
• Extended rule of three
• Calculation of roots
• Continued mulfiplcation aXbXcXd...etc.
• Cubes without intermediate notes

Commerce and Industry

• Checking of invoices and goods
• Percentage calculations

A)Percentage increase

B)Percentage decrease

C)Profit margin

D)Compound percentages

E)Profit and loss

F)Capital and wilh simultaneous control (only CURTA Type II)

Technical and Survey calculalions

• Division into a negative number (complementary number)
• Calculation of co-ordinates
• Determination of the amount of silver in an alloy (only CURTA Model II)
• Determination of the angles in an acute-angled triengie, given three sides
  (only CURTA Model II)
• Determinaton of a side of an obtuse-angled triangle (given the two other sides and their included angle
• Calculation of area from co-ordinates
• Calculation of the distance between two poinis, given their co-ordinates (using Pythagoras' theorem)
• Calculation of distance and azimuih (only CURTA Model II)
• Linear interpolation

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