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# Number Line Slide Rule

IP.com Disclosure Number: IPCOM000073665D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 35K

IBM

## Related People

Carey, HB: AUTHOR

## Abstract

A slide rule type device for performing arithmetic operations on positive and negative numbers involves a slider 11 which is movable relative to a fixed lower number line 12 and an upper number line 13. Slider 11 has positive numbers on one side and negative numbers on the other. A movable pointer 14, similar to that of a conventional slide rule, is also employed. Its operation is as follows.

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Number Line Slide Rule

A slide rule type device for performing arithmetic operations on positive and negative numbers involves a slider 11 which is movable relative to a fixed lower number line 12 and an upper number line 13. Slider 11 has positive numbers on one side and negative numbers on the other. A movable pointer 14, similar to that of a conventional slide rule, is also employed. Its operation is as follows.

To add plus (positive) quantities, set the zero on the slide to the augend on the number line and move the pointer to the right (in the positive direction) for the number of spaces to be added by the addend. The answer is indicated on the number line by the pointer. To subtract plus quantities, set the zero to the minuend on the number line and move the pointer to the left (in the negative direction) the required number of spaces to be subtracted. The answer is indicated on the number line by the pointer.

To add minus quantities, set the zero of the slide to the augend on the number line and move the pointer the number of spaces left (negative direction) required by the addend. The answer is read at the pointer on the number line. This process is equivalent to subtracting positive numbers. To subtract minus quantities, set the subtrahend on the slide to the minuend on the number line and read the answer on the number line at the zero of the slide. The answer is found to the right or in the plus direction. This process is equivalent to adding positive n...