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.  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 some metal polish on the end brackets and a wipe-down with Windex.
Hemmi 32 Four-Inch
Vest Pocket  Mannheim Slide Rule


   Click on picture to enlarge.

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,
Factory Instructions.

Price
$88.

.
Hemmi 34RK Five-Inch 
Pocket Mannheim




Click on picture to enlarge.
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 instruction book included.
 

Rule and case are brand new (rule is still sealed in factory plastic).  Instruction manual is a new photocopy.   

Brand new.

Includes
Slide Rule,
Leather Case,
Instruction Manual.

Price
$70.

.

Hemmi 149A Pocket Duplex

Engineering Slide Rule




Click on picture to enlarge.

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
$140.

.
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
$235

.
 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 factory leather case (not pasteboard case, shown) and  49-page factory instruction manual.  

Everything like new; rule is still sealed in factory plastic bag.  



 Also available:  One new Hemmi 259D in two-piece pasteboard case.  Rule is unused and still in sealed factory plastic.  Case is unused but shows light yellow stains (see photo at left).  Instruction Manual is a new photocopy.   $118.

Brand new.

Includes
Slide Rule,
Factory Leather Case and Instruction Manual  

$200.

.
 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.

$280

.
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.

$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 5 mm thick 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.

$150.

.
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. 

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

.
.

Used Slide Rules

K+E 4181-1 with case


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 with pocket clip.  

Both rule and case are in near-mint condition.  No damage or graffiti.
Used

Includes
Slide Rule, 
Sheath.

Price
$50

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

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.
.
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