USD $119
10″ Logarex/Koh-I-Noor Darmstadt Slide Rule VERY LATE MODEL, made in Czechoslovakia. Powerful, brand new full sized rule with front and back cm/inch edge rulers, smooth black scales, 3 log log scales on the slide reverse, pythagorean and trig scales, and 4 line cursor, and dual reverse side body cursors. Unusually marked, this rule contains ONLY scale equivalents, no arbitrary letters. Has a soft black padded leatherette case with top flap, and the name of the UK distributor for Logarex (Hellerman) embossed on one side. A very powerful and well-designed rule, but uncommon in North America. Like Pickett rules, this is lithographically made, not engraved, and has a shiny top coating for protection of the printed scales. A very nice desk rule to use for many purposes, thanks to the dual rulers. The 4 page Hellerman basic instructions are included.
(14 Scales, 4 cursor lines, 2 Rulers) (RH)
FRONT- cm/ log, sq rt(1-X2), X3, X2, [ X2, 1/X, X, ] X, sin, tg, s-t
BACK- inch/ [ e0.01X, e0.1X, eX ] Factors on the body area
Stock: 27
USD $65
A visually beautiful rule, complete with 2 part plastic case and factory box. The 544A features the trademark S/M blue slide and body braces, multi-line (5 line) cursor, plus two color (red/black) scale markings, and folded scales. The rule is self documenting on the right hand side for all scales. Staedtler-Mars rules are highly requested but quite uncommon in North America, and are very well made designs. Attractive blue slide and body braces, complement the bright blue and white two part plastic case. The folded scales are especially useful for mark-up/discount calculations, and a center index is well marked for this. The ‘invisible brace’ style with braces on the back gives the rule a very clean European look from the front.
Blank on the reverse side. These were still sealed in a factory bulk pack, so everything is in mint condition. We have included reprints of the S/M consolidated rule instructions because these came factory packed with no instructions.
(8 Scales, 5 Cursor Lines) (RH)
Front – K, DF, [ CF, CIF, CI, C, ] D, A
Back – Blank
Stock: 7
USD $320
Class C: Good condition. Some visible scale bleeding on one or both sides. The (very rare) display case is discolored, has a scratch on one end, and a crack on the other.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 1
USD $129
12″/10″ Full Size Duplex Trig Slide Rule
Includes special multi-decade expanded scales, capable of an astonishing 20-60 decades of dynamic range.
Eye Saver yellow aluminum construction with black and red contrasting scales, very high quality, American Made, Pickett rule. A very useful rule, ideal for many engineering tasks.
(18 Scales)
Front – K, A, [ B, T, S, CI, C, ] D, L
Back – K*, A*, [ B*, T*, S*, CI*, C*, ] D*, L*
Stock: 1
USD $85
12″/10″ Full Size Simplex Trig Slide Rule
This isa self-teaching rule, with extensive directions on the reverse side.
T (Traditional) White aluminum construction. Very high quality, American Made, Pickett rule. An excellent student rule with good trig capability, includes the original box, leather case, and instruction manual.
(9 Scales)
Front – K, A, [ B, T, S, CI, C, ] D, L
Back – instructions, fractional/decimal equivalents
Stock: 1
USD $95
12″ / 10″ Trig Slide Rule
Very nice trig rule with black and red (inverse) scales, on the yellow (Eye Saver) body. This has the split square root scales, S, T and ST, plus DI scale for more calculating power and precision. Includes black textured leather case with gold embossed Pickett logo.
(17 Scales)
Front – K, A, [ B, ST, T, S, C ], D, DI
Back – L, DF, [ CF, CIF, CI, C ], D, DI
Stock: 1
USD $159
12″ / 10″ Dual Base Log Log Speed Slide Rule
Includes original user manual and leather case. Dual log scale design with repeated C/D scales and DI scale for ease and speed of use.
This is a very sophisticated Log Log rule, made in the trademark adjustable aluminum body format by Pickett, an enhanced N500/800 design with added scale features.
Note that the full Pickett teacher’s manual is now on line in Adobe Acrobat PDF format HERE for you FREE!
(28 Scales)
Front – LL0-0.001, LL0+0.001, LL1+0.01, LL1-0.01, DF, [ CF, CIF, L, CI, C ], D, LL2+0.1, LL2-0.1, LL3+1.0, LL3-1.0
Back – Sq Rt1, Sq Rt2, K, A, [ B, ST, T, CI, S, C ], D, DI, DFm
Stock: 1
USD $139
12″ / 10″ Hi Log Log Duplex Slide Rule
Eye-saver yellow (ES) coated aluminum construction, black and red scales. This is a very sophisticated Log Log rule, made in the trademark aluminum body format by Pickett. Comes with original Pickett leather case.
Note that the full Pickett teacher’s manual is now on line in Adobe Acrobat PDF format HERE for you FREE!
(22 Scales)
Front – LL2+0.1, LL2-0.1, DF [ CF, CIF, L, CI, C ] D, LL3+1.0, LL3-1.0
Back – LL1+0.01, LL1-0.01, A, [ B, T, ST, S, C ] D, DI, K
Stock: 2
USD $129
One of Pickett’s more advanced rules, this 22 scale, aluminum body rule comes in Eye-saver yellow (ES), with black and red scales. This is a very sophisticated Log Log rule, made in the trademark aluminum body format by Pickett. The original case on this rule has some wear and damage, but does come with the belt loop accessory.
Scales include:
Front – LL2+0.1, LL2-0.1, DF [ CF, CIF, L, CI, C ] D, LL3+1.0, LL3-1.0
Back – LL1+0.01, LL1-0.01, A, [ B, T, ST, S, C ] D, DI, K
Stock: 1
USD $165
Class D(ish): What happens when you have a rule of this type that’s missing a box and some other items, that’s not quite a Class D, but isn’t quite a Class E? The result? The Dish Class. Reasonable condition. Visible/pronounced scale bleeding on both sides, the case on this rule isn’t as nice as a full Class D, but it’s also on sale…
Faber Castell’s advanced duplex log log rule, widely used in Europe but seldom seen in North America, This rule has a plastic body with adjustable gold anodized aluminum end braces, black and red filled and engraved scales, plus green accent stripes. This is a powerful design with the Rietz overrange scale extensions, Pythagorean scale (P) 6 log log scales and w and W’ expanded square root scales. Scales are sall self-documenting on the right hand side, and the rule has a 5/6 line cursor.
Scales include:
Front – T1, T2, K, DF, [ CF, CIF, CI, C, ] D, S, ST, P
Back – LL03, LL02, LL01, W2 [ W2′, L, C, W1′, ] W1, LL1, LL2, LL3
Stock: 1
USD $49
ES (Eye-Saver) Yellow aluminum construction, high-quality American made, Pickett rule. An excellent student rule with good trig capability, that never loses its instruction manual (it’s printed on the back).
The case on this rule is damaged and in poor condition.
Scales include:
Front – K, A, [ B, T, S, CI, C, ] D, L
Back – instructions, fractional/decimal equivalents
Stock: 1
USD $49
This is an advance 24 scale rule, that features feet on both sides of the rule for easy desktop use, and a cursor with 6 markers. As with most Aristo rules, it comes with black and red scales, as well as yellow bands on the slide for easier reading.
This rule has pronounced discoloration on both sides, but is still in very usable condition.
Scales include:
Front – LL01, LL02, LL03, DF, CF, CIF, L, CI, C, D, LL3, LL2, LL1
Reverse – LL00, K, A, B, T, ST, S, C, D, DI, LL0
Stock: 1
USD $95
An excellent full sized Trig rule, great for high school students. All scales are self documenting on the right hand side. Nestler’s late production style duplex rule. BRAND NEW rule, with 2 part plastic case. Has normal and folded basic scales (at 3), expanded trig scales, and a 6 line cursor. Has green body supports, and a pale green stripe on the entire slide (both sides), and black and red filled/ engraved scales.
Scales include:
Front – K, A, [ B, CI, C, ] D, L
Reverse – T1, T2, DF, [ CF, CIF, CI, C, ] D, S, ST
Stock: 1
USD $35
This is an excellent starter rule which features additional markings on the scales to help explain the core functions of multiplication and division.
Scales include:
Front – A, B, CI, C, D, K, S, L, T
Back – Blank
Stock: 3
USD $175
This is a very sophisticated 34 scale rule, made in the trademark aluminum body format by Pickett, an extremely powerful but somewhat crowded rule. Has hyperbolic scales, expanded trig, square and cube root scales, DI and two types of folded scales. Comes with the original brown leather case.
Scales include:
Front – LL1+.000, LL1-.000, LL2+.00, LL2-.00, DF/m, [ CF/m, TH, SH, SH, L, CI, C, ] LL3+.0, LL3-.0, LL4+0., LL4-0.
Back – 3 cube root scales, DF [ CF, CIF, T, T, ST, S, CI, C, ] D, DI, 2 square root scales
Stock: 2
USD $29
An economical and practical student rule for the beginner slide rule enthusiast! Plastic body, with contrast color slide for easier reading. Comes with a leatherette case.
Scales include:
Front – L, K, A, B, CI, C, D, ST, T, S
Back – Blank
Stock: 2
USD $25
A clear and easy to read student rule, with yellow (taupe?) contrast bands on the rule for easier reading. Includes a leatherette case.
Scales include:
Front – A, DF, CF, CIF, CI, C, D, K
Back – Blank
Stock: 2
USD $29
An economical and practical student rule for the beginner slide rule enthusiast! Plastic body, with contrast color slide for easier reading.
Scales include:
Front – L, A, DF, CF, CI, C, D, ST, T, S
Back – Blank
Stock: 1
USD $75
This 24 scale full size rule features a green slide for easy reading, and high-contrast black and red scales. Comes with the original blue leather Staedtler case.
This rule has damage to one of the end brackets, and has been discounted.
Scales include:
Front – CI, T, ST, DF, CF, CIF, CI, C, D, P, S, CS
Back – LL01, LL02, LL03, A, B, L, K, C, D, LL3, LL2, LL1
Stock: 1
USD $195
Very good condition log log duplex rule, with hyperbolic sine and tangent scales, additional vector/radian engineering scales, and inverted sine/tangent scales. Has folded scales, extended/inverted trig scales, and 3 log log scales. A very nice high end bamboo duplex rule, with a very uncommon scale set.
This rule comes with its factory box, and carton slip case.
Scales include:
Front – Sh1, Sh2, Th, A, [ B, TI1, TI2, SI, C, ] D, DI, x, theta
Back – L, K, DF, [ CF, CIF, CI, C, ] D, LL3, LL2, LL1
Stock: 1
USD $195
Log log duplex rule, similar to the POST Versalog, but with both A and B scales. Has folded and extended trig scales, and 8 log log scales. A very nice high end bamboo duplex rule, and one of Hemmi’s most popular models outside North America. This specific rule comes with the original factory box, and carton slide case instead of the leather case.
Scales include:
Front – LL/1 (e-0.01<-0.1), LL/2 (e-0.1<-1.0), LL/3 (e-1.0<-10), DF, [ CF, CIF, CI, C, ] D, LL3 (e+1>10), LL2 (e+0.1>1.0), LL1 (e+.01>.1).
Back – L, K, A, [ B, T, S, ST, C, ] D, DI, LL0 (e+.001>.01), LL/0
Stock: 1
USD $275
Class D (reduced from USD$325): Reasonable condition. Visible/pronounced scale bleeding on both sides, case may have considerable dark spots and/or discoloration.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges.
This specific rule comes in a rare FC slide box, as opposed to the standard leather case.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 1
USD $45
This may be a more basic rule for students, but it still has a variety of very useful features. It has a metric ruler on the upper edge of the rule, high contrast green scale accents, and black and red scales.
Scales include:
Front – K, A, B, L, CI, C, D, S, ST, T1, T2
Back – blank
Stock: 3
USD $139
One of Pickett’s more advanced rules, this 22 scale, aluminum body rule comes in Eye-saver yellow (ES), with black and red scales. This is a very sophisticated Log Log rule, made in the trademark aluminum body format by Pickett. Comes with the original leather case.
Scales include:
Front – LL2+0.1, LL2-0.1, DF [ CF, CIF, L, CI, C ] D, LL3+1.0, LL3-1.0
Back – LL1+0.01, LL1-0.01, A, [ B, T, ST, S, C ] D, DI, K
Stock: 1
USD $69
ES (Eye-Saver) Yellow aluminum construction, high-quality American made, Pickett rule. An excellent student rule with good trig capability, that never loses its instruction manual (it’s printed on the back).
Scales include:
Front – K, A, [ B, T, S, CI, C, ] D, L
Back – instructions, fractional/decimal equivalents
Stock: 11
USD $75
An excellent rule for promising engineers, this 22 scale rule comes with a formula reference card and rules, as well as a manual. Unfortunately they are in German, but math is the universal language, right?
Scales include:
Front – L, K, A, B, BI, CI, C, D, LL1, LL2, LL3
Back – T1, T2, DF, CF, CIF, S, C, D, S, ST, P
Stock: 1
USD $75
One side of the case may say Teledyne Post, but the other definitely says Hemmi. This is a beginner, single sided rule, that features feet on the reverse side for easier desktop use. We’ve only got one manual in stock, so not all rules come with manuals.
Scales include:
Front – T, K, A, B, CI, C, D, L, S, ST
Back – Blank
Stock: 3
USD $275
K+E’s famous Deci-Lon duplex rule, in very good condition. These cases are slightly different, being stitched/formed leather, as opposed to a folded/stitched leather case. Does not include any supplementary sheets or documents. This is K+E’s late production flagship rule, with unbreakable cursor, Ivorite body and adjustable frame, all free of marks, names or initials. Has 8 log log scales, a split square root scale, DI and folded scales. An outstanding and powerful rule, cleverly designed.
Scales include:
Front – Ln-3, Ln-2, Ln-1, Ln-0, A, [ B, T, SRT, S, C, ] D, DI, K
Back – Sq1, Sq2, DF, [ CF, CIF, L, CI, C, ] D, Ln0, Ln1, Ln2, Ln3
Stock: 3
USD $75
An advanced 24 scale rule that comes in a presentation case, rule features feet on the reverse side for easier desktop use.
Scales include:
Front – ST, T, T2, DF, CF, CIF, CI, C, D, DI, P, S
Back – LL01, LL02, LL03, A, B, L, K, C, D, LL3, LL2, LL1
Stock: 1
USD $275
K+E’s famous Deci-Lon duplex rule, in very good condition, with very good orange sewn leather case, and supplementary instruction/formula sheets. This is K+E’s late production flagship rule, with unbreakable cursor, Ivorite body and adjustable frame, all free of marks, names or initials. Has 8 log log scales, a split square root scale, DI and folded scales. An outstanding and powerful rule, cleverly designed.
Scales include:
Front – Ln-3, Ln-2, Ln-1, Ln-0, A, [ B, T, SRT, S, C, ] D, DI, K
Back – Sq1, Sq2, DF, [ CF, CIF, L, CI, C, ] D, Ln0, Ln1, Ln2, Ln3
Stock: 1
USD $149
This 12 scale rule includes its original box and manual, and the rule features feet on the reverse side to enable easier desktop use.
Scales include:
Front – LL01, LL02, LL03, DF, CF, CIF, CI, C, D, LL3, LL2, LL1
Back – T, ST, K, A, B, BI, CI, C, D, L, P, S
Stock: 1
USD $69
This beginner bamboo rule features a metric ruler on the upper edge of the rule, and an imperial rule on the lower edge.
Front – K, A, B, CI, C, D, L, S, ST, T
Back – Reference data and usage instructions
Stock: 1
USD $175
Powerful, new full sized rule with leather case, engraved black/red scales, adjustable bamboo body, framed glass cursor. Specialized electronics scales are described in the advertisement below. An uncommon and useful rule.
Operating manual can be downloaded here.
Scales include:
Front – db, Neper, DF [ CF, CIF, CI, C, ] D, LL3, LL2, LL1
Back – A, L, [ C, SI, TI ] D, Lambda, F
Stock: 1
USD $425
Class A (reduced from USD$495): Excellent/mint condition. Green cases may have some small dark spots/discoloration, brown cases have no discoloration. May have some minor scale bleeding on the reverse side of the rule (non-color side).
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 2
USD $425
Class A (reduced from USD$495): Excellent/mint condition. Green cases may have some small dark spots/discoloration, brown cases have no discoloration. May have some minor scale bleeding on the reverse side of the rule (non-color side).
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 1
USD $375
Class B (reduced from USD$425): Very good condition. Green cases may have some dark spots/discoloration. Some scale bleeding on reverse side (not the full color side) of the rule.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 9
USD $375
Class B (reduced from USD$425): Very good condition. Green cases may have some dark spots/discoloration. Some scale bleeding on reverse side (not the full color side) of the rule.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 4
USD $325
Class C (reduced from USD$375): Good condition. Some visible scale bleeding on one or both sides. Some dark spots or discoloration on case.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 8
USD $325
Class C (reduced from USD$375): Good condition. Some visible scale bleeding on one or both sides. Some dark spots or discoloration on case.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 2
USD $275
Class D (reduced from USD$325): Reasonable condition. Visible/pronounced scale bleeding on both sides, case may have considerable dark spots and/or discoloration.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 12
USD $275
Class D (reduced from USD$325): Reasonable condition. Visible/pronounced scale bleeding on both sides, case may have considerable dark spots and/or discoloration.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 3
USD $125
Class E: Poor condition. Extensive scale bleeding and discoloration on one or both sides. Case may have considerable dark spots and discoloration.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 1
USD $125
Class E: Poor condition. Extensive scale bleeding and discoloration on one or both sides. Case may have considerable dark spots and discoloration.
Considered to be the most advanced slide rule produced: gold anodized adjustable aluminum end braces, duplex 5/4-line cursor, two color (red/black) scale markings, and trademark mint green stripe on primary scales (both sides), plus additional blue stripes on the A and B scales, and massive 2 1/4″ wide body. Expanded W square root scales, for both the square root of x and 10x, 8 log log scales, and raised rubber bumpers to prevent cursor scraping, and to give the rule grip on a desktop. Body is fully alignable at the aluminum end-pieces, and provides finger grip areas on the slide for better movement. Cursor pops off (note the recess on the side bars) for easy cleaning, while retaining its alignment, a very handy feature! Rule is self documenting on right hand side for all scales. Has Pythagorean scale (P), expanded square scales, folded scales and scale over-ranges. Includes: Original box, case, original manual in Spanish, reprint manual in English, and accessory rule.
Scales include:
Front – T1, T2, K, A, DF, [ CF, B, CIF, CI, C, ] D, DI, S, ST, P
Back – LL03, LL02, LL01, LL00, W2 [ W2′, CI, L, C, W1′, ] W1, LL0, LL1, LL2, LL3
Stock: 2
USD $195
Long before Samsung was trying to sneak a stylus into their smartphones, Faber Castell was already concealing them in their slide rules. This is a very rare surviving example of one of those rules, that features a small stylus that is concealed in the upper left corner of the rule, and can be slid out to operate the addiator integrated into the back of the rule. Rule features an imperial ruler on the upper edge, and a metric ruler on the lower edge.
Scales include:
Front – 7 scales (+ Cos, ST, T scales on the reverse side of the slide)
Back – Addiator and unit conversion instructions.
Stock: 1
USD $35
This is a more basic rule that is more geared towards drafting and surveying. It features 12 scales (two along the lower vertical edge of the rule), and a metric ruler along the upper edge of the rule.
Scales include:
Front – Scale identification not clear, but it does include C, D, S, T, ST
Back – Reference formulae and data (in German)
Stock: 1
USD $75
This is a rule designed more for beginners, and incorporates a variety of useful features. It includes metric rulers on both the upper and lower edges of the rule, however, the ruler on the lower edge places the “0” mark in the center of the rule with markings increasing outwards towards each end of the rule.
Scales include:
Front – K, A, B, BI, CI, C, D, DI, L, T2, T1, ST, S
Back – Unit conversion table, formula references, and usage instructions
Stock: 1
USD $85
This is a very unusual vintage wood rule from Nestler, which features a metric ruler along the upper edge of the rule, and two supplementary scales along the lower vertical edge, read out using a small lens fixed to the lower edge of the main cursor.
Scales include:
Front – Unsure on exact nomenclature of certain scales, but there are 9 scales including the two on lower edge of the ruler, and the following on the reverse side of the slide: S, S&T, T
Back – Constants and data tables (in German)
Stock: 1
USD $65
An advanced double sided slide rule, featuring an alternate color slide (light green – the color of minty freshness) for easier reading.
Scales include:
Front – CT, T, ST, DF, CF, CIF, CI, C, D, P, S, CS
Back – LL01, LL02, LL03, A, B, L, K, C, D, LL3, LL2, LL1
Stock: 1
USD $165
This all plastic rule features 25 scales, and has rubberized feet to keep the rule fixed in place for desktop use. This rule includes the rule, original case, and conversion/formula table.
Scales are as follows:
Front – LL01, LL02, LL03, DF, CF, CIF, K, CI, C, D, LL3, LL2, LL1
Back – LL00, L, T>45, A, B, T<45, SRT, S, C, D, P, DI, LL0
Stock: 1
USD $65
This bamboo, nine scale, full size rule features imperial and metric rulers on the upper and lower edges of the rule. Includes original box, manual, and case.
Scales include:
Front – L, D, 360, C, D, A, S, S&T, T
Back – Formulas, data tables
Stock: 1
USD $225
Don’t let the box fool you, this rule is in excellent shape and is still in its sealed factory plastic. It features 24 scales, and is a rule for advanced users.
Scales include:
Front – L, F, K, A, B, K’, CI, C, D, LL3, LL2, LL1
Back – CL, SL, M, TL, R, ST, T, S, C, D, DI, SIN/COS
Stock: 1
USD $85
This all-metal 23-scale rule has some unique features. The reverse side of the rule features a split scale, with instructions outlined in the centre of the rule, and positive values read on the left end of the scale, and negative values on the right.
Scales are as follows:
Front – ^-3, ^-3, ^-3, L, T, T, ST< S, CI, C, D, ^-2, ^-2
Back – C, D, T’, T’, ST’, S’, DN, RN-DZ, ^-2, ^-3
Stock: 1
USD $30
This 13-scale full size rule features large, color contrasted scale for easy reading, and operating instructions printed on the reverse side of the rule. Includes the original case and operating instructions (in German).
Scales are as follows:
Front – A, DF, CF, CIF, CI, C, D, kW, k
Back – Z’, N’, Z, N, instructions
Stock: 1
USD $35
This 13-scale full size rule features large, color contrasted scale for easy reading, and operating instructions printed on the reverse side of the rule. Includes the original case, box, and operating instructions (in German).
Scales are as follows:
Front – A, DF, CF, CIF, CI, C, D, kW, k
Back – Z’, N’, Z, N, instructions
Stock: 1
Sphere Research Corporation 
