POCKET CALCULATOR

The utility model relates to a pocket calculator which is composed of a plurality of rotary discs provided with the same center. The radius of each rotary disc is different, and the discs are ranged according to size order. The rotary disc is provided with addition and subtraction scale, and multipl...

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Bibliographic Details
Main Authors ZHOU SISAN, FANG YOUXI ET AL, QIAN YIYUAN
Format Patent
LanguageEnglish
Published 23.01.1991
Edition5
Subjects
ANALOGUE COMPUTERS
CALCULATING
COMPUTING
COUNTING
PHYSICS
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Summary:The utility model relates to a pocket calculator which is composed of a plurality of rotary discs provided with the same center. The radius of each rotary disc is different, and the discs are ranged according to size order. The rotary disc is provided with addition and subtraction scale, and multiplication and division scale. Four arithmetic operations and the continuous calculation of the four arithmetic operations can be carried out conveniently and rapidly by rotating each rotary disc. The user does not need to be trained specially and a pithy formula does not be memorized and recited. The utility model has the advantages of fast calculation speed, no miscalculation, simple structure, and convenient carrying. The pocket calculator can enlighten the digital concept of younger students simultaneously.
Bibliography:Application Number: CN1990212342U