Mechanical Calculators

Home > Mechanical Calculators

Kingson Four-Rule

Kingson Four-Rule

The "Addiator" side for addition and subtraction, with the  operating stylus in its holder.

Kingson Four-Rule

The slide-rule side.

Kingson Four-Rule Calculator

Is a Slide-Rule on one side and a 6-decade "Addiator" type calculator on the other side.

For use with totals up to 999,999, or, by putting the decimal point two places from the right, currenccies up to 9,999.99

Addition and subtraction using the "Addiator" type calculator (see the Addiator in this section) and multiplication, division, square roots, and reciprocals using the slide rule.

160 x 40 x 8 mm (6.25" x 1.6" x 0.3").

1960s to early 1970s.

Made in Hong Kong.

 

This was a way of incorporating the full four functions, as well as square roots and reciprocals, into a pocket-sized calculator which was much, much cheaper than the early electronic calculators.

Home
1) Mechanical Calculators
2) Desk Electronic Calculators
3) Hand-held Calculators
4) Non-Decimal Calculators
5) The Pocket Calculator Race
6) Calculator Companies
7) Calculator Photo Library
8) Calculator Articles
9) British Calculator Companies
10) Puzzle Corner
11) Calculator Time-line
12) Calculator Technology
13) Index to the Calculators
14) Calculator Resources
15) Frequently Asked Questions
16) Update Information
17) Vintage Calculator News
18) Bletchley Park
19) About this site
20) Search this Site

Mechanical Calculators

Odhner
Comptometer
Addiator
Addometer
Golden Gem
S & N
Monroe LN-160X
Brunsviga 10
Curta I
Facit C1-13 & ESA-01
Plus Adder
Madas 20BZS
Burroughs Add-lister
Resulta
Bowler Countess
Olivetti Electrosumma
Muldivo Mentor
Busicom
SCM 1011 CB
Sumlock Comptometer 993s
Kingson Four-Rule
Imperial Office Master
Addiator Addfeet Junior

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2014 except where noted otherwise.