We are currently adding to the updated slide rule repository as we verify our inventory, please do not hesitate to consult the old site - however, please note that the old site has not been regularly updated since 2022.

We will be periodically be putting overstock slide rules on sale, so be sure to keep an eye on the sale seciton of this page (changes monthly).

Pocket Rule, Extremely rare

As visible on the front of the rule, this wood K&E pocket rule dates back to 1900, and it is rare to find a rule of this vintage in this good a condition. This is a single sided rule, with an integrated 5" ruler on the top edge.

Scales are as follows:**Front** - A, B, C, D**Back** - Common unit conversion table

Stock: 1

Pocket Rule

This combination slide rule/ruler comes with the original box and case. The box and case are not in great condition, but the rule has held up well.

Scales are as follows:**Front** - A, C, D, K, CF, DF, CI, S, B, L, T**Back** - 6" / 13cm ruler

Stock: 1

Full Size Rule With Addiator

This rule is specifically designed for business math and currency calcualtions. It features an imperial ruler along the top edge of the rule, and separate markings for handling currencies. On the reverse side of the rule is a mechanical addiator, operated using the included stylus, and formulas/directions for completing conversions, interest payments, and pensions.

Scales are as follows:**Front** - DF, CF, CI, C, D, L, SH/D, $, LL1, LL2**Back** - Operating instructions, formulas, addiator

Stock: 1

Over Size Rule

This oversize rule measures approx 56.5cm, and features an imperial ruler long the upper edge of the rule, and a metric ruler along the lower square edge of the rule.

Scales are as follows:**Front** - A, B, CI, C, D, S, ST, T**Back** - Operating instructions, formulas, conversion tables

Stock: 2

Over Size Rule

This oversize rule measures approx 56.5cm, and features a metric ruler long the upper edge of the rule. The lower edge of the rule features the S&T scales, readable using the wraparound cursor on the body of the rule.

Scales are as follows:**Front** - A, B, CI, C, D, S, T. LL1. LL2, LL3**Back** - Operating instructions (in german), formulas, conversion tables

Stock: 1

Full Size Rule, With box

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

Full Size Rule, No box

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

Pocket Rule

This rare 13-scale pocket rule features a metric ruler along the top edge, and an imperial ruler on the reverse side of the rule. This is an all plastic rule, and comes with the original instruction sheet in German.

Scales are as follows:**Front** - Metric ruler, L, K, A, B, CI, C, D, F, S, T, LL1, LL2, LL3**Back** - Imperial ruler

Stock: 1

Pocket Rule

This rare Faber Castell wood rule features 8 scales on the rule proper, a metric ruler on the upper edge of the rule, and another logarithmic reference on the lower edge of the rule where you would normally find an imperial ruler. There is some separation beginning between the plastic and wood body on the top left of the rule.

Scales are as follows:**Front** - 7 Scales**Back** - Reference and conversion references (in German)

Stock: 1

Pocket Rule

This rare Faber Castell wood rule features 7 scales on the rule proper, and metric/imperial rulers on the upper and lower edges fo the rule.

Scales are as follows:**Front** - 7 Scales**Back** - Reference and conversion references (in German)

Stock: 1

Full Size Rule

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:

Stock: Lots!

12"/10", Simplex Trig Rule

NEW boxed sets complete with Case, Manual, and Warranty Certificate, **all have extensive directions on the reverse of the rule!**

ES (Eye-Saver) Yellow aluminum construction, T (traditional) white construction. Very high quality, American Made, Pickett rule. An excellent student rule with good trig capability. **Boxes have carton creases, storage scuffs, tears and marks, we will ship the best first.** These are transitional sets, the rule is marked N902ES (late production), but the box still says 902ES.**(9 Scales)**
**Front** - K, A, **[** B, T, S, CI, C, **]** D, L**Back** - instructions, fractional/decimal equivalents

Stock: Lots!

Pocket Rule

A beginner plastic simplex rule, this Pickett pocket rule is great for beginners or for casual adventurers worried about losing their higher end pocket rules while spelunking. Don't leave the Bat Cave without this!

Scales include: **Front** - A, B, C, D, L, K, CI**Back** - Blank

Stock: 1

Full Size Rule

This rule is new and still in it sfactory sealed bag, the case is also in excellent condition with no staining or wear. As features, this rule has 15 scales, a metric ruler along the upper edge of the rule, and formulas and data conversion tables on the back.

Scales include:

Front - T, K, A, B, BI, CI, C, D, P, S, L, LL0, LL1, LL2, LL3

Back - Formulas and data tables

Stock: 1

Full Size Rule

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

Pocket Rule

Marketed under GeoTec/hughes-Owens, this bamboo pocket rule is still marked on the rule as a Sun/Hemmi rule. It features 23 scales, and includes the original box, manual, and case.

Scales include:

Front - LL/1, LL/2, LL/3, T, ST, S, C, D, LL3, LL2, LL1

Back - LL0, LL/0, K, DF, CF, CIF, CI, C, D, R1, R2, L

Stock: 1

Full Size Rule

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

Magnification Pocket Rule

This seven scale pocket rule features an unusual cursor design, with a bulkier metal frame on only three sides of the cursor. Imperial/metric ruler on the upper and lower edges of the rule. As is true of most Hemmi rules, this is a bamboo rule.

Scales include:

Front - A, B, C, D, S, L, T

Back - Blank

Stock: 1

Magnification Pocket Rule

This seven scale pocket rule features a magnifying cursor, and imperial/metric ruler on the upper and lower edges of the rule. As is true of most Hemmi rules, this is a wood body rule.

Scales include:

Front - A, B, C, D, S, L, T

Back - Blank

Stock: 1

Magnification Pocket Rule

This eight scale pocket rule features a magnifying cursor, and imperial ruler on the upper edge of the rule. As is true of most Hemmi rules, this is a wood body rule.

Scales include:

Front - A, B, C, CI, D, S, L, T

Back - Blank

Stock: 1

5" Pocket Rule

This small Hemmi pocket rule is similar to the K&E 4031, and is slightly larger than a Hemmi 30. Features a magnifying cursor, and metric/imperial rules on the upper and lower edges of the ruler.

Scales include: **Front** - A, B, C, D, S, L, T**Back** - Blank

Stock: 1

Pocket Rule

This bamboo rule is still in its original factory sealed plastic, however, the rule does show signs of discoloration and marking from having been stored for so long. The case is also fairly worn and has lost its finish in multiple areas. Ruler in inches along the upper edge of the rule.

Scales include the following:**Front** - A, C, D, K, CF, DF, CI, L, TI1, TI2, SI1**Back** - Blank

Stock: 1

Pocket Rule

Still in excellent condition, this Hemmi Versatrig rule was released as a Geotec branded rule, but still includes the original Sun Hemmi markings. Original leather pocket case with clip included.

Scales include the following:**Front** - C, D, K, CF, DF, CI, R1, R2, CIF**Back** - A, C, D, L, S, T, DI, ST

Stock: 1

Full Size Rule

This full size rule features 31 scales, original factory box, case, original manual, and support ruler with conversion tables. The rule itself features rubber standoff feet for use on a desktop. There is some rust damage to the retaining screw on the cursor.

Scales include:**Front** - LL00, LL01, LL02, LL03, DF, CF, CIF, L, CI, C, D, LL3, LL2, LL1, LL0**Back** - H2, Sh2, Th, K, A, B, T, ST, S, P, C, D, DI, Ch, Sh1, H1

Stock: 1

Pocket Rule

Truly worthy of the title "pocket rule", the Piccolo is only 1" wide, and still features a metric ruler along its upper edge, a magnifying cursor, and yellow scale coloring for easier reading.

Scales include:**Front** - A, C, D, CI, CF, DF**Back** - Blank

Stock: 1

Pocket Rule

This single sided rule is suitable for the mathematician on the go and features clear plastic edging on the upper and lower ruler edges with imperial and metric rulers.

Scales include:**Front** - X, XZ, X2, X3, X 2/Z, 1/X, SIN, TG, ROOT (1-X2), LGX, E^X, E^0.1X, E^0.01X**Back** - Blank

Stock: 1

Over Size Rule

This oversize rule measures approx 58cm, and features a metric ruler along the upper edge of the rule. Along the lower, square, edge of the rule are the S&T scales for the rule, readable using the extended cursor that wraps around the edge of the rule.

Scales are as follows:**Front** - K, A, B, CI, C, D, F, S, T, LL1, LL2, LL3**Back** - Formulas, data conversion tables

Stock: 1

Full Size Rule

This full size rule features 13 scales, with color contrasted markings for easy reading. There is a mteric ruler along the top edge of the rule, and commonly used formulas and data conversion tables on the reverse side of the rule.

Scales are as follows:**Front** - L, K, A, B, CI, C, D, P, S, T, LL1, LL2, LL3**Back** - Formulas, data conversion tables

Stock: 1

Full Size Rule

This full size rule features 25 scales, and includes the original case and included formula/data rule (which includes common geometric formulas, and unit conversions).

Scales are as follows:**Front** - Th, Sh2, Sh1, A, B, T<45, T<45, ST, S, D, DI, K**Back** - LL01, LL02, LL03, DF, CF, CIF, L, CI, C, D, LL3, LL2, LL1

Stock: 1

Pocket Rule

This all plastic rule features 24 scales, and includes the factory original box, manual, and case.

Scales are as follows:**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

Full Size Rule

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

Full Size Rule

An all-plastic rule, the Omega 797 features 22 scales and comes with the original factory box and manual. It also features rubber stand-off feet on both side of the rule for easy desktop operation.**
**

Scales are as follows:

Stock: 1

12"/10", Precision Log-Log Rule

An outstanding and attractive rule from Hope Slide Rule Manufacturing Co. in Japan, these rules are inmint condition, â€‹complete with plastic white/green 2-part case and an English factory manual.

Perfect sets of a very advanced **Log Log rule** with **blue accent stripes** on primary scales, **RED inverse scale markings**, plus **self-documenting** on the right hand side. Has **4 trig scales (T1, T2, ST and S)**, PLUS **P pythagorean scale**, an exceptionally rich scale set and excellent user features.

White plastic body and end braces with engraved and filled scales in red/black. Folded scales are at 3, with Pi also marked. Front ABCD scales also have **over-range** at both ends. **
**

Stock: Lots!

10" Rule

New and in mint condition, made in Czechoslovakia. A great beginner and student rule.

Basic Rietz format rule (has over-range scale extensions for easier operation) with added reference features. It has a black/red **self-documenting scale arrangement** and pale yellow slide. The slide reverse has trig (S, ST, T) scales, and the back has a treasure trove of useful data and factors. It has a slightly magnifying multi-line simplex cursor design that does area of a circle, plus some other interesting stuff like horsepower conversion. These are beautifully made rules, very well constructed. We will include basic instruction reprints, as these came bulk packed with with no manuals.

Stock: Lots!

Polymath Multiplex Rule

Wood rule with all metal braces, and glass/metal cursor. includles the original leather case, and separate conversion table and formula reference card.

Scales include: **Front** - C, D, L, CF, DF, CI, CIF,LL2, LL3, LL02, LL03 **Back** - A, B, D, K, S, T<, T>,DI, ST, LL1, LL01

Stock: 1

5" Pocket Rule

This is a very basic rule made from a wood body and laminated plastic for the scales. It looks like it was used for instructional or educational purposes, and was produced in bulk. The scales are starting to delaminate, making some of the numbers harder to read. Definitely an unusual piece of history.

Scales include: **Front** - A, B, C, D,K, CI**Back** - Blank

Stock: 1

Pocket Rule, w/Sphere Case

This Staedtler rule features metal cursor end caps, and metal braces with supporting ridges to allow for desktop use of the rule. Includes a new leather case engraved with the Sphere Research Logo.

Scales include: **Front** - A, B, C, D, L, K, LL1, LL2, LL3, LL01, LL02, LL03**Back** - C, D, P, S, T, CF, CI, DF, CS, CT, ST, CIF

Stock: 1

Pocket Rule

An absolute mathematical rapier of the pocke rule world, this Satedtler rule has enough scales for even the most significant problems. Includes original leather clip pocket case.

Scales include: **Front** - C, D, CF, DF, CI, CIF, LL1, LL2, LL3, LL/1, LL/2, LL/3**Back** - A, B, C, D, K, L, P, S, T, LL0, LL/0

Stock: 1

Pocket Rule

Still in good condition, this rule has no scale bleeding and moves smoothly. Features imperial and metric rulers on the upperand lower edges of the rule, back features standard unit conversions.

Scales include: **Front** - A, B, C, D, K, CI, S, L, T**Back** - Unit conversion chart

Stock: 1

X2 Pocket Rule

Made under the joint marques fo KOH-I-NOOR and Graphoplex is this X2. Features a metric ruler along the top edge and original leather case in good condition.

Scales include: **Front** - a, b, b^2, B, B^2, B^3, L, LL1, LL2, LL3, cos, S, T, S&T**Back** - Blank

Stock: 1

Pocket Rule

Featuring the Nestler green central slide, this rule has no scale bleeding and is in excellent condition. Features an imperial ruler along the upper edge fo the rule.

Scales include: **Front** - X, X2, X3, 1/x, SIN, COS, LL1, LL2, LL3**Back** - Blank

Stock: 1

Pocket Rule

This pocket rule set comes with the original factor case, rule, and secondary ruler and reference card.

Scales include: **Front** - A, B, C, D, L, K, LL1, LL2, LL3, LL01, LL02, LL03**Back** - C, D, P, S, T, CI, CF, DF, CS, CT, ST

Stock: 1

Full Size, 25 Scales

This fairly rare rule from French manufacturer Grphoplex incorporates some physical features on the rule that are not seen on most others. On each side of the rule's end brackets are rubberized feet that keep the rule's body away from the surface it's on so that it can be used resting on a desk.

Being French, the manual and forumula reference card are both written in French.

Scales include: **Front** - A, B, C, D, L, P, S, T, DI, ST, LL0, LL00**Back** - C, D, K, CF, CI, DF, CIF, LL1, LL2, LL3, LL01, LL02, LL03

Stock: 1

From French manufacturer Graphoplex comes the Roplex circular rule. Included instructions are in French, as is the wordin gon the rule itself. Unlike other circular rules, this rule is entirely encased, with scale/slide movement and cursor movement effected via the two adjustment dials in the top corners.

Stock: 1

3.5" Circular Slide Rule

Using two winding knobs, this calculator rotate concentric discs to read out calculations. Combined with the original leather carrying case, this rule feels almost like a fine pocket watch.

Stock: 1

Wire/Motor Calculator

On one side, this handy calculator is useful for calculating wire sizes based on distance and current, and conversely for determining maximum distances based on cable size and current. The other side handles conversions for motor power output.

Stock: 1

Measure

This small pocket measure comes in its original leather carrying case, and uses a small toothed rotating wheel to measure inches/feet as it is rolled, and read-out on the moving dial of the tool. Each side of the tool features multiple different scales.

Stock: 1

Ruler / Paperweight

This ruler uses temperature responsive liquid crystals to read-out room temperature in C/F. It also features metric and imperial measures on the upper and lower edges, and a slide in the center for completing metric/imperial conversions for mass, volume, and distance.

Stock: 1

If you're still refusing to use the metric system, and don't want to do your calculations using fractional lengths of football fields, then this circular slide chart will be very useful. On the inner ring it provides calcualtions in both fractional and decimal quantities.

Stock: 1

If you're still refusing to use the metric system, and don't want to do your calculations using fractional lengths of football fields, then this circular slide chart will be very useful. On the inner ring it provides calcualtions in both fractional and decimal quantities.

Stock: 1

Type CPU-41/P

Don't be caught in the cockpit without this device! Set comes complete with case, manual, multiple charts, and double sided circular slide rule.

Provides arithmetic and vector solutions for for aircraft speeds of 90 to 2 000 knots, with consideration of errors due to aircraft acceleration. Dead reckoning capability of a plotting board.

Stock: 1

Classical & Historical Planisphere

This chart is configured for 30-40 degrees in the southern hemisphere. This chart not only helps identify which stars are visible at any hour and day, but also shows this information thousands of years into the past, the present, and well into the future.

Stock: 1

Star-Finder 2102-D

This star finder and identifier is more versatile than many others, as it comes with 10 different latitude overlays ensuring this star-finder is useable in many different areas.

Includes manual, 10 latitude overlays, double-sided circular map/chart, and protractor.

Stock: 1

Variable Scale

Designed by H. Joseph Gerber, survivor of a Nazi concentraition camp, the Gerber Variable Scale is used to easily complete calculations on graphs and curves. It is used for graphical applications for which reading, plotting, and interpolating needs to be done.

Both the scale and leather case are in excellent condition.

Stock: 1

This acrylic slide chart has metric and imperial rulers on the upper and lower edges, integrated temperature conversion (F/C), and a sliding component for converting between different metric and imperial units (mass, volume, area, length, etc).

Stock: 1

This is a combined lot of overstock drafting rulers, from a variety of manufacturers (Dietzgen and Pickett, to name but a few). Whatever your measuring or drafting needs, there's a fair chance that what you need can be found in this case of rulers.

Stock: 1

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