THE SLIDE RULE TRADING CO., Paul Ross
Slide Rules for Sale

Brand New Slide Rules

These slide rules were purchased from retail stores or distributors or from collectors who bought them from a retail store or distributor.  They have been unsold on store shelves for 35-40 years and the boxes show shelf wear.  Boxes have been opened and the rule may have been examined by prospective buyers but it has never been in daily use.  The edges are sharp and the markings are crisp. All the original documents and accessories are included.  Except for rules described as "in original factory plastic," new rules have been freshly cleaned and aligned.  (But don't count on the rule maintaining alignment on its trip to you.)

Slide rules in original plastic bags have not been cleaned or aligned.  Some collectors, including myself, like having rules that have been sealed since they left the factory.  However, 35-40 years of storage have effect even on slide rules in sealed plastic bags:  The metal end brackets have dulled; the stators are usually out of alignment and some grit has deposited the celluloid surface.  The rules can be returned to 1970 condition with a wipe-down of Windex and metal polish on the end brackets.
Hemmi 32 Four-Inch
Vest Pocket  Mannheim Slide Rule


   Click on picture to enlarge and sharpen it.

Four-inch closed-body bamboo slide rule with  magnifying cursor.   Scales are A [B, CI, C] D and [S, L, T] plus a 10-cm measuring scale on the top edge.    Complete, brand new package includes slide rule, brown leather sheath, 40-page factory instruction book, and shelf box.

Rule, case and box are brand new, factory perfect; instruction book has remnant of retail label on front cover, otherwise perfect.

Brand new.

Includes
Box, 
Slide Rule,
Leather Case,
Instructions.

Price
$81.

.
Hemmi 34RK Five-Inch 
Pocket Mannheim




Click on picture to enlarge and sharpen it.
Hemmi's "thin" pocket version of desk model 50 slide rule.  Scales A [B, CI, C] D, K and [S, L, T].  Plastic cursor provides moderate magnification.    Rule carries Odelco trademark on back; case has ODELCO embossed in gold.  40-page factory instruction book included.
 

Rule and case are brand new (rule is still sealed in factory plastic).  Instruction book has remnant of retail label on front cover, otherwise perfect. 

Brand new.

Includes
Slide Rule,
Leather Case,
Instruction Manual.

Price
$70.
Out of Stock

.

Hemmi 149A Pocket Duplex

Engineering Slide Rule




Click on picture to enlarge and sharpen it.

Hemmi's only pocket duplex slide rule--very similar to Post 1461 Pocket Versalog.  22 scales: LL/1, LL/2, LL/3, DF [CF, CIF, CI, C]  D, LL3, LL2, LL1 and L, K, A [B, TI, SI, C]  D, LL0, LL/0.


Rules are complete with factory instructions and Hemmi leather sheath--all in original Hemmi box.  Rule is marked "Hemmi No. 149A" and "ODELCO;" box is marked "SUN HEMMI NO. 149A, HEMMI SLIDE RULE."


Rule and case are perfect.  Boxes are slightly crushed and yellowed and cover of instructions shows slight yellowing.  Best boxes ship first.



Brand new, unused and sealed in original factory plastic.

Includes
Box,
Slide Rule,
Leather Case, 
Factory Instructions.

Price
$111.

.
Hemmi 255D Electrical Engineering Slide Rule
Click on picture to enlarge.
Very advanced duplex rule with hyperbolic scales.  Scales are L, K, DF [CF, CIF, CI, C]  D, LL3, LL2, LL1 and Sh2, Sh1, Th, A [B, TI2, TI1, SI, C] D, DI, chi, theta.   All the benefits of Hemmi's famous bamboo construction complete with brown leather case and 52-page Instruction Manual.  Rule is marked "ODELCO in addition to the usual "Hemmi No. 255D;" cases and instructions carry only the Hemmi name.

Rule is unused and still sealed in factory plastic.  Case is perfect.  Instructions are new photocopies.  

Brand new.

Includes
Slide Rule,
Leather Case,  Instructions. 

Price
$205

.
 Hemmi 257L Chemistry Slide Rule

Rear of rule shown.  Click on picture to enlarge.
Ten-inch duplex bamboo slide rule for chemists and chemical engineers.  Front scales (L, K, A, DF [CF, CIF, CI, C] D, LL3, LL2, LL1) are designed for efficient multiplication, division and exponentiation. Rear scales (Ch A-M, Ch N-Z, M1 [M2, ToF, ToC, ToK, LM]  mmHg, Kg/cm2, in hg Vac, tw) are designed for calculations involving molecular weight, temperature and pressure.  For example, the first two scales constitute a table of molecular weights;  setting the hairline on "H2O" automatically places the hairline on 18.3 (the molecular weight of water) on the D scale.  There are other scales which you can figure out since it comes with an instruction manual.  Complete with brown leather Hemmi flip-top case. 

Small ODELCO trademark on front of rule plus "HEMMI JAPAN NO. 257L" on back.  Frederick Post model 1491 Chemistry Rule was an earlier version of this rule. 

Rule is unused and still sealed in factory plastic.  Case is perfect.  Instructions are a photocopy of the original manual.

 Brand new and unused.
 
 

Includes
Slide Rule, 
Leather Case,
Instruction Manual.
 

Price
$376.

.
Hemmi 259D Mechanical Engineering Slide Rule

Click on picture to enlarge.
Final edition of the Hemmi 159/259/259D expert mechanical engineering slide rule.  Scales are LL/1, LL/2, LL/3, DF [CF, CIF, CI, C]  D, LL3, LL2, LL1 and L, K, A [B, T, S, ST, C]  D, DI, LL0, LL/0.   A beautiful bamboo duplex rule.  Complete with two-piece pasteboard Hemmi case and 49-page Instruction Manual.  Rule is marked "Hemmi No. 259D" with no other brand markings. 



Rule is unused and still in sealed factory plastic.  Case is unused but shows light yellow stains.  Instruction Manual is a new photocopy.


Brand new.

Includes
Slide Rule,
Case, 
Instruction Manual.

Price
$108.

.
 Hemmi 260 Advanced Engineering Slide Rule

Click on picture to enlarge.
Incredibly sophisticated bamboo duplex slide rule with a three-hairline cursor and 25 scales including LL/1, LL/2, LL/3, DF [CF, CIF, CI, C]  D, LL3, LL2, LL1 and LL/0, LL0, K, A [B, T, S, ST, C]  D, DI, P, L.  Complete with 49-page Instruction Manual and brown leather Hemmi case. Rule is marked "Hemmi No. 260" and "ODELCO;" case and instructions carry only the Hemmi name.

Rule is unused and still sealed in factory plastic.  Case is perfect.  Instruction Manual is factory original.


 Brand new, unused and sealed in original factory plastic.

Includes
Slide Rule,
Leather Case,
Instruction Manual.

$258

.
Hemmi P261 Advanced Engineer (Darmstadt) Duplex
Click on picture to enlarge.
An all-plastic duplex slide rule based on the "Darmstadt" scale set.   Scales are LL01, LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 and T, ST, K, A [B, BI, CI, C] D, L, P, S.  Rear of cursor has one full width hairline and three short hairlines.  Very advanced construction with 5 mm thick plastic body, no end brackets on face of rule, and end brackets on rear that hold the cursor away from the desktop.  Complete with plastic blow-molded case, 48-page factory instruction manual, and shelf box. 

The shelf box shows very slight wear at the edges; everything else is in true mint condition. 

Brand new, unused and sealed in original factory plastic.

Includes
Slide Rule,
Plastic Case,
Factory Instructions,
Shelf Box. 

Price
$135.

.
Hemmi P262 Advanced Engineer (Rietz) Duplex
Click on picture to enlarge.
An all-plastic duplex slide rule based on the "Rietz" scale set.  Scales are LL01, LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 and K, A, R1, R2 [T2, T1, ST, S, C] D, L, LL00, LL0.  Very advanced construction with  th5 mmick plastic body, no end brackets on face of rule, and end brackets on rear that hold the cursor away from your desktop.  Complete with plastic blow-molded case, 44-page factory instruction manual, and shelf box. 

Unlike illustration, the stators of these rules are pale blue; slide is medium blue as shown.  Everything is in true mint condition except boxes which range from like new to slightly crushed; best boxes ship first. 

Brand new, unused and sealed in original factory plastic.

Includes
Slide Rule,
Plastic Case,
Factory Instructions,
Shelf Box. 

Price
$137.

.
Hemmi 269 Civil Engineering Slide Rule
Back of rule shown.  Click on picture to enlarge.


Brand new, unused and in original factory plastic.  Ten-inch bamboo duplex slide rule with 25 scales for the Expert Civil Engineer: L, F, K, A [B, K', CI, C]  D, LL3, LL2, LL1 and CL, SL, M, TL [R, ST, T, S, C]  D, DI, SinCos(1), SinCos(2).  Complete with brown Hemmi leather case and 57-page Instruction Manual.  Rule is marked "Hemmi No. 269" in navy and "Civil" in bright red plus small ODELCO brand mark.


Rule is unused and still sealed in factory plastic.  Case is perfect.  Your choice of original factory printed or newly photocopied Instruction Manual.

Brand new.

Includes
Slide Rule,
Leather Case,
Instruction Manual. 

Price
$200 (Photocopied Instructions)
$210
(Factory Printed Instructions)

.


Keuffel & Esser 68-1287 Pocket
Log Log Duplex Decitrig


(Old model number 4181-1)


Click on picture to enlarge it.
 

One of K&E's most popular pocket slide rules.  Front scales: LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2.  Rear scales LL01, L, K, A [B, T, SRT, S] D, DI, LL1.  Complete with tan leather case, shelf box, factory instruction manual, pamphlet "How to Take Care of your K+E Slide Rule," and a brief catalog describing and illustrating seven K+E slide rules.

Everything except shelf box is in mint, unused condition.  Shelf box is sound but worn and split for an inch and a half along one corner.

Rule is marked "4181-1" and shelf box is marked "68-1287, Old 4181-1."  This dates the rule to 1962 when K+E model numbers changed from 4xxx-x to 68-xxxx or shortly thereafter.  Instruction book is labeled "Log Log Duplex Decitrig, No. 68-2047 (Old 4187S)."  
68-2047 and 4187S were catalog numbers for the instruction manual which is generic to several different K+E Log Log Duplex slide rules.       
Brand new.

Includes
Slide Rule,
Leather Case,
Instruction Manual, shelf box and other items. 



Price

$93
.

Used Slide Rules

 
Pickett N1010-ES  Trig
Pic: Pickett N1010-ES with case
Click on picture to enlarge it.

An all-metal slide rule in Pickett's patented "Eye-Saver" yellow. Seventeen scales.  (Front: K, A [B, ST, T, S, C] D, DI.  Rear: DF [CF, CIF, CI, C] D, DI, L.)   Brown imitation leather sheath.


The slide rule end brackets have lost their shine due to age but nether the rule nor the case show any signs of use. (There is some illegible graffiti on case which has been polished over but is nevertheless detectable upon close inspection.)  



Used

Includes
Slide Rule, 
Imitation Leather Sheath. 

Price
$25.

.
 
Pickett 120-T and 120-ES Microline
Pickett 120-ES with sheath

Pickett 120-T with case
Click on picture to enlarge it.



Late model all-plastic student slide rule with nine scales: K, A, [B, S, T, CI, C] D, L.  Back of rule is completely blank.  In "True-Color" white or "Eye-Saver" yellow.  Rules are identical except for color.  

Solid black imitation leather sheath.  (Scan process added some iridescent brown to image.)

Both rules are like new: No signs of use or age on rule or sheath.

Used

Includes
Slide Rule, 
Imitation Leather Sheath.

Price
$20 each
or
both for $35.



Pickett N500-ES Log Log Duplex


Click on picture to enlarge it.

Pickett N500-ES all-metal slide rule in "eye-saver" yellow.  Front scales: +LL2, -LL2, DF [CF, CIF, L, CI, C] D, +LL3, -LL3.  Rear scales: +LL1, -LL1, A [B, T, ST, S, C] D, DI, K.  

Luxurious suede leather case over rigid plastic frame.  Embossed "PICKETT" in gold.

Both rule and case are in outstanding condition with negligible signs of use.
Used

Includes
Slide Rule, 
Suede Leather Case.

Price
$45.
.


Pickett N300-ES Pocket Duplex









Click on picture to enlarge it.

Pickett N300-ES Pocket Log Log duplex sidle rule in "eye-saver" yellow.  Front scales:  LL1, A, [B, T, S, C] D, LL2.  Rear scales: LL3, DF [CF, CIF, CI, C] D, L.  

Suede leather sheath embossed "PICKETT" in gold.  

I believe this rule was sold by Pickett as part of a matched pair with the
N500-ES Log Log Duplex rule listed immediately above.  There are no signs of use or wear on the rule or its case.  

Used

Includes
Slide Rule, 
Sheath.

Price
$75

.
Logarex 27251 Pocket Darmstadt
Click on picture to enlarge it
 Logarex Pocket Rule. Although the rule is marked "Darmstadt" the scale set is unusual.  Front scales:  SQRT(1-x2), x3, x2 [x2, 1/s, x] x, sin, tg.  Rear scales:  [e0.01x,  e0.1x,  ex].  Top edge is 0-13 cm measuring scale. Dark brown leather pocket case.  

Rear of rule is imprinted "Electronska Industrija, Electronic Components" and case is embossed with "Ei" logo.  Electronska Industrija is a diversified manufacturer of electronic components (and one of the last manufacturers of vacuum tubes) in Serbia.  

Both rule and case are in unused mint condition.  


     .
Used

Includes
Slide Rule, 
Case.

Price
$21


Keuffel & Esser 4181-1 

Pocket Slide Rule








Click on picture to enlarge.

Keuffel & Esser 4181-1 Pocket Duplex Slide Rule.  K+E's most popular pocket rule.  Front scales: LL03, LL02, DF [CF, CIF, CI, C] D, LL3, LL2. Rear scales: LL01, L, K, A [ B, T, SRT, S] D, DI, LL1.  Made of "Ivorite" ABS plastic.  

Green leather sheath.  

I have several of these rules for sale.  All rules are in near-mint condition but their cases show minor signs of wear.  Worst is the case whose back is shown above with a small tear near lower left of picture.  No graffiti.   Best cases ship first.
Used

Includes
Slide Rule, 
Sheath.

Price
$46

.

Dietzgen 1776 Pocket Redirule











Click on picture to enlarge it

Dietzgen 1776 Redirule with factory instructions.  All plastic pocket slide rule with 15 scales.  Front: DF [CF, CIF, CI, C] D, L.  Rear: K. A [B, T, ST, S] D DI.  

Tan leather pocket case with metal clip.

31-page factory instruction manual.  (Not shown.)       

Rule is like new.  Pocket clip on case has corroded at top and leather shows flex marks but no other signs of use.  Instruction manual seems unread but front cover has small water stain and rear cover is dog-eared.  


Used

Includes
Slide Rule, 
Case, Instructions.

Price
$37

.
 
Dietzgen N1725 Vector Type Log Log
 

 Click on picture to enlarge it.

Dietzgen N1725 Vector Type Log log Microguide slide rule with 25 scales.  Front scales: LL01, LL02, LL03, DF [CF, CIF, L, CI, C] D, LL3, LL2, LL1.  Rear scales: Th, Sh2, Sh1, A [B, T<45o, T>45o, ST, S] D, DI, K.  High quality celluloid on mahogany construction.  

High quality black leather case.  

Very slight signs of use. No graffiti, chips or stains on either rule or case.     

Used

Includes
Slide Rule, 
Case.

Price
$40

.
Dietzgen N1725 Vector Type Log Log
 
 Click on picture to enlarge it.
Dietzgen N1725 Vector Type Log log Microguide slide rule with 25 scales.  Front scales: LL01, LL02, LL03, DF [CF, CIF, L, CI, C] D, LL3, LL2, LL1.  Rear scales: Th, Sh2, Sh1, A [B, T<45o, T>45o, ST, S] D, DI, K.  High quality celluloid on mahogany construction.  

High quality tan leather case.  

Almost no signs of use but a previous user has emphasized the  "e" and "pi" gauge marks on the C and D scales (Click on large picture above.) and there is a fraction to decimal conversion table neatly glued to back of case.  (See small picture at right.)  There is also some faint illegible graffiti under case flap.     

Used Includes
Slide Rule, 
Case.

Price
$20

.
 
Acumath 400 Student Slide Rule



Click on picture to enlarge it.  



Very fine all-plastic slide rule with nine scales:  S, K, A [B, CI, C] D, L, T.  Back of rule is blank.  

Sheath is high-quality imitation leather.  

Rule is like new; sheath is like new except for a couple of dark marks picked up from lying on some dark surface on one side.  Other side (not shown) is perfect.    

Used

Includes
Slide Rule, 
Imitation Leather Sheath.

Price
$25.

.



.



.


Aristo Nr 814 Pocket Elektro










Click on picture to enlarge it.
Aristo Nr 814 Pocket Elektro Slide Rule.  Very sophisticated all-plastic special-purpose slide rule.  There are measuring scales on the front (cm) and back (inches) of the top edge, seven calculating scales on the front of the rule, three on the back of the slide and two in the gutter.  There are four hairlines on the cursor and one on the transparent left end of the slide.   Special gauge marks for the conductivity of copper and aluminum.  Marked "Aristo Nr 814" and "Dennert & Pape, Hamburg."

Leather case is perfect fit but it is marked "A W Faber Castell."  

Both rule and case show few signs of wear.  No damage, discoloration or graffiti.  


Used

Includes
Slide Rule, 
Case.

Price
$27.
.



.
Nestler No 21 Darmstadt Slide Rule
Nestler 21 with Case
Click on picture to enlarge it.

A marvelous old rule in spectacular condition.  Front scales: K, A [B, CI, C]  D, Cos.  [LL1, LL2, LL3] on back of slide.  (Scales are not labeled.)   0-27 cm and Log scale on top, slanted, edge and two more calculating scales (sin5o and tg5o) on bottom vertical edge.  There is also a measuring scale in the bottom of the well.  Cursor has three hairlines plus tab on top (for reading Log scale on top edge of rule) and a tab on bottom (for reading
sin5o and tg5o on bottom edge).  This is the only slide rule with calculating scales on both the top and bottom edges of which I am aware. 

Two-piece black pasteboard case which still carries inside label from original seller ("Wilhelm Fahrig, Braunschweig").  Case has been covered with brown fabric.  

Rule has yellowed with age but all marking are as clear and sharp as if they had been engraved this year.  No chips, wear, or graffiti.  Case has been neatly covered with a tightly-fitting custom-made cloth slipcover.  The slipcover may be glued to the pasteboard case.  The slipcover seems a bit dirty but shows no wear.       

I estimate the date of manufacture of this slide rule to be about 1922.  That is based on the celluloid veneer being screwed to the substrate and the general style of the rule; I can find no reference to Nestler model 21 anywhere.  Peter Hopp's earliest listing of Nestler rules is from a 1924 catalog; models 1 through 43 were listed but number 21 was one of several models omitted--perhaps because it had been discontinued in 1924 but my guess is because it was too expensive to generate substantial sales.  The cursor is of a design that was patented in 1937.  (DRP 650658)  The cursor carries no patent number, which implies that it was manufactured before the patent was issued.  The International Slide Rule Museum has photographs of models 21 with later cursor designs and without the veneer screws.    

Used

Includes
Slide Rule, 
Case.

Price
$86.
.
Castell 1/87 Rietz Slide Rule
Castell 1/87 with case
Click on picture to enlarge it.

Ten-inch "Rietz" slide rule.  Front scales: K, A [B, CI, C] D, L with [sin, sin/tg, tg] on the back of the slide.  Base wood is light colored (maple?), not the usual mahogany.   Faber Castell manufactured this model from 1935 to 1939.

Case is two-piece black pasteboard marked "A. W. Faber Castell, Syst. Rietz  1/87" in gold.    "1/87" is stamped in gold on end of case.

Rule is like new, case would be like new also if not for two or three places where the surface has lost its shine.    
Used

Includes
Slide Rule, 
Case.

Price
$25.
.
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