Octal/decimal calculator

Claim 2

A calculator according to claim 1 wherein the said graduations are selected to correspond to at least each two-digit octal number in the range of the scale.

Claim 3

A calculator according to claim 1 wherein the said indicator means includes first and second movable members adapted to move relative to each other and relative to the base means.

Claim 4

A calculator according to claim 1 wherein: a. the base means comprises a substantially circular member; and b. the indicator means comprise first and second radial indicator arms attached to the center of the base means, the arms being adjustable in their angular relationship to each other and rotatable relative to the base means.

Claim 5

A calculator according to claim 1 including an inverse octal base scale on said base means having an effective length equal to that of the said octal base scale and having octal base numbers graduated in descending order relative to the octal base scale and arranged such that the length of the said inverse octal base scale is divided into a plurality of segments defined by indicia corresponding to the octal numbers 1 through 10, the said scale segments having graduations corresponding to fractional portions of the numbers with reference to the origin of the scale beIng a function of the octal logarithms of the numbers; and wherein the said indicator means is movable relative to the said base means for adding intervals corresponding to selected portions of either of said octal base and inverse octal base scales and indicating resultant values on either of said scales.

Claim 6

A calculator according to claim 1 including an octal square scale on said base means having an effective length equal to that of the octal base scale and having octal base numbers graduated and arranged such that the first and second halves of the said octal square scale are respectively divided into a plurality of segments defined by indicia corresponding to the octal numbers 1 through 10, the said scale segments having graduations corresponding to fractional portions of each of the said octal numbers, and the relative positions of the numbers with reference to the origin of each half of the scale being a function of the octal logarithms of the numbers; and wherein the said indicator means is movable relative to the said base means for adding intervals corresponding to selected portions of either of said octal base and octal square scales and indicating resultant values on said scales.

Claim 7

A calculator according to claim 1 including an octal logarithm scale on said base means having an effective length equal to that of the octal base scale and having octal base fractions graduated linearly and arranged such that the length of the said octal logarithm scale is divided into a plurality of segments defined by indicia corresponding to octal fractions between 0 and 1, the said scale segments having graduations corresponding to fractional portions of each of the said octal fractions; and wherein the said indicator means is movable relative to the said base means for adding intervals corresponding to selected portions of either of said octal base and octal logarithm scales and indicating resultant values on said scales.

Claim 8

A calculator according to claim 1 including a plurality of decimal conversion scales on said base means, each scale having an effective length equal to that of the octal base scale with decimal base numbers graduated from 8M to 8M 1 where M represents a positive integer, a negative integer, or zero, the relative positions of the said numbers with reference to the origin of each scale being a function of the octal logarithms of the numbers; and wherein the said indicator means is movable relative to the said base means for adding intervals corresponding to selected portions of said octal base and decimal conversion scales and indicating resultant values on said octal base and decimal conversion scales.

Claim 9

A calculator according to claim 1 including an octal normalization scale on said base means having an effective length equal to that of the octal base scale and having octal base numbers graduated and arranged such that the said octal normalization scale is divided into three identical sections of equal length, each section being further divided into a plurality of segments defined by indicia corresponding to the octal numbers 4 through 10, the said scale segments having graduations corresponding to fractional portions of each of said octal numbers, and the relative positions of the numbers with reference to the origin of each scale section being a function of the octal logarithms of the numbers; and wherein the said indicator means is movable relative to the said base means for adding intervals corresponding to selected portions of said octal base scale and indicating resultant values on said octal base and octal normalization scales.

Claim 10

A calculator according to claim 9 including a plurality of decimal conversion scales on said base means, each scale having an effective length equal to that of the octal base and octal normalization scales with decimal base numbers graduated from 8M to 8M 1 where M represents a poSitive integer, a negative integer, or zero, the relative positions of the said numbers with reference to the origin of each scale being a function of the octal logarithms of the numbers; and wherein the said indicator means is movable relative to the said base means for adding intervals corresponding to selected portions of said octal base and decimal conversion scales and indicating resultant values on said octal base, octal normalization, and decimal conversion scales.

Claim 11

The calculator of claim 1, wherein said calculator is a slide rule calculator means and further comprising: scale means bearing indicia representing number base 10 in logarithmic intervals of logarithm base 10; and scale means for converting indicia representing number base 8 to indicia representing number base 10.

Claim 12

The slide rule of claim 11, wherein: said conversion scale means includes a scale element bearing indicia representing number base 10 in logarithmic intervals of logarithm base 8.

Claim 13

The slide rule of claim 12, wherein: said conversion scale means include k said scale elements corresponding to a range of 8k to 8k , where k2 is greater than k1, k2 - k1 k and k is a positive integer.

Claim 14

The calculator of claim 1, wherein said calculator is a slide rule calculator means and further comprising: scale means bearing indicia in logarithmic intervals of logarithm base 10; scale means bearing indicia in equal intervals modulus 8 representing number base 8; and scale means bearing indicia in equal intervals modulus 10 representing number base 10.

Claim 15

The slide rule of claim 14, wherein: said scale means are circular and concentric.

Claim 16

The slide rule of claim 15, wherein: said indicator means includes a pair of cursor elements rotatable about the common center of said concentric scale means.

Claim 17

The slide rule of claim 14, wherein: said logarithm base 8 scale means include k scale elements corresponding to a range of 8k to 8k , where k2 is greater than k1, k2 - k1 k and k is a positive integer.

Claim 18

The slide rule of claim 17, wherein: k is 1010, k1 is -5 and k2 is +5.