USD $125
Nestler 21a, 20 inch rule. Featuring white laminate on pearwood, 3 inch wide cursor with a mark for the lg scale on the top edge and a wrap-around for the bottom edge scales. Includes the original, two-piece, black cardboard case (poor condition).
(14 scales, metric ruler)
Front – K, A [B, CI, C] D, SIN, COS + On the top beveled edge, 55cm, lg + On the bottom edge, sin, tg
Back – [LL1, LL2, LL3] + Reference data (in German)
Stock: 2
USD $250
13″/10.5″ Duplex Log Log Slide Rule – Includes original brown leather case (minor wear marks), rule has some scale bleeding and discoloration.
One of the nicer plastic body rules ever made, with anodized adjustable aluminum end braces, duplex 5/3-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides). This rule also has 6 log log scales, and paired K scales for 3 decade operations. Body is fully alignable at the aluminum end-pieces.
Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), BI scale, dual Tangent scales (T1/T2), folded scales and scale over-ranges.
(24 scales, 8 cursor lines)
Front – L, T1, T2, A, [ B, BI, CI, C, ] D, ST, S, P
Back – LL03, LL02, LL01, K [ K’, C, CIF, CF, ] DF, LL1, LL2, LL3
Stock: 1
USD $250
13″/10.5″ Duplex Log Log Slide Rule – Includes original display case, box, and manual reprint. Heavy damage to box, and some scale bleeding and discoloration on the rule.
One of the nicer plastic body rules ever made, with anodized adjustable aluminum end braces, duplex 5/3-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides). This rule also has 6 log log scales, and paired K scales for 3 decade operations. Body is fully alignable at the aluminum end-pieces.
Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), BI scale, dual Tangent scales (T1/T2), folded scales and scale over-ranges.
(24 scales, 8 cursor lines)
Front – L, T1, T2, A, [ B, BI, CI, C, ] D, ST, S, P
Back – LL03, LL02, LL01, K [ K’, C, CIF, CF, ] DF, LL1, LL2, LL3
Stock: 1
USD $185
These bamboo body rules feature engraved scales with black and red marking, and are still sealed in their original factory plastic bags. Features an imperial ruler along the upper edge, metric ruler on the lower edge, plastic cursor, and common reference data on the reverse side
(15 Scales, 2 Rulers inches/CM)
Front – T, K, A [ B, BI, CI, C] D, P, S + imperial ruler
Back – [L, LL0, LL1, LL2, LL3] Data and conversion factors + metric ruler
Stock: 2
USD $125
An early model of the 80k electro rule, bamboo body rule with metal framed glass cursor. Still in its original factory plastic. Some age spots and discoloration, as well as wear/markings on the slip case.
Features dedicated scales for Volts, Current 9A), kW, and Dynamo/Motor.
(13 Scales, 1 Ruler inches)
Front – 9 scales + 1 scale on lower edge/side of rule + imperial ruler on upper edge
Back – [S, L, T] Data and conversion factors
Stock: 2
USD $25
A very basic beginner pocket slide rule with 6 scales. Features all plastic construction, and a single cursor line. Includes the original plastic slip case.
(6 Scales)
Front – A [B, CI, C] D, K
Back – Blank
Stock: 1
USD $1
A novel pen case from Australia, that reads out multiplication tables from 1 to 12 using an internal rotating cylinder.
Stock: 15
USD $65
An easy to use beginner, pocket, circular rule, that includes the original plastic slip case and manual.
(4 Scales)
Front – A, D, C, CI
Back – Blank
Stock: 1
USD $220
Gilson’s most famous aluminum circular slide rule, with alternating yellow/white stripes and fractional converter/operator scales. This rule was made by Gilson in Florida but was often sold by numerous other companies, including POST, Dietzgen, Tavella, Bruning and others.
This is a very powerful rule, with 3 sets of trig scales (sin/tan), giving performance equal to a much larger straight rule, and still has the original printed manual.
The rule has unique fractional ‘binary’ scales that permit operations directly with fractional numbers, and also drill size scales. Cases for these rules were made of random fabric materials at the factory, and each one is a bit different.
(21 Scales)
Front – C, CI, A, K, L, Log Log (1.0015-1,000,000), fractions, fractions, drill/thread, mm
Back – degrees, sines, tans, degrees, sines, tans, degrees, sines, tans, Fractional Conversions
Stock: 220
USD $249
Gilson’s most famous aluminum circular slide rule, with alternating yellow/white stripes and fractional converter/operator scales. This rule was made by Gilson in Florida but was often sold by numerous other companies, including POST, Dietzgen, Tavella, Bruning and others.
This is a very powerful rule, with 3 sets of trig scales (sin/tan), giving performance equal to a much larger straight rule, and still has the original printed manual.
The rule has unique fractional ‘binary’ scales that permit operations directly with fractional numbers, and also drill size scales. Cases for these rules were made of random fabric materials at the factory, and each one is a bit different.
(21 Scales)
Front – C, CI, A, K, L, Log Log (1.0015-1,000,000), fractions, fractions, drill/thread, mm
Back – degrees, sines, tans, degrees, sines, tans, degrees, sines, tans, Fractional Conversions
Stock: 4
USD $249
Gilson’s most famous aluminum circular slide rule, with alternating yellow/white stripes and fractional converter/operator scales. This rule was made by Gilson in Florida but was often sold by numerous other companies, including POST, Dietzgen, Tavella, Bruning and others.
This is a very powerful rule, with 3 sets of trig scales (sin/tan), giving performance equal to a much larger straight rule, and still has the original printed manual.
The rule has unique fractional ‘binary’ scales that permit operations directly with fractional numbers, and also drill size scales. Cases for these rules were made of random fabric materials at the factory, and each one is a bit different.
(21 Scales)
Front – C, CI, A, K, L, Log Log (1.0015-1,000,000), fractions, fractions, drill/thread, mm
Back – degrees, sines, tans, degrees, sines, tans, degrees, sines, tans, Fractional Conversions
Stock: 7
Sphere Research Corporation