Hemmi Slide Rule Archive  New Illustrated Format  
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Click to VISIT or RETURN CLICK HERE To go back to the Slide Rule Marketplace Hemmi currently models known to exist: Originally Compiled by: Bill (William) Lise 1/1, 100, 100K, 101, 101A, 1001 (circular), 1002 (circular), 102, 103, 104, 107, 108, 110, 130, 135, 136, 143, 149A, 150, 152, 153, 154, 165, 2/1, 200, 201, 22, 250, 251, 254W, 255, 255D, 256, 257, 257L, 259, 259D, 260, 2634, 2640, 266, 2662, 2664, 2664S, 2670, 269, 2690, 275, 275D, 279, 279D, 30, 301, 301A, 305, 31, 32, 33, 34P, 34pi, 34R, 34RK, 34T, 35, 36, 40, 400, 401, 405, 40F, 40RK, 41, 410, 43A, 43D, 45, 451, 45K, 46, 47, 48, 5, 50, 50/1, 50/1 pi, 50/1F, 50/3, 50W, 51/1, 51/3, 52, 53, 54, 55, 6, 60/3, 61/3, 62/3, 63/3, 64, 640S, 64T, 65, 651, 66, 66F, 67, 68, 69, 70, 72, 74, 8, 80, 80/1, 80/3, 80K, 81/1, 81/3, 84, 85, 86, 86/3, 86K, 87/3, 9, 90, 91, 92, 93, 94, 95, 96, Baseball Slide Rule, Body Weight Balance Slide Rule, DP121, DP122, P141, P23, P24, P253, P253 Vectolog, P261, P262, P263, P271 Moist Air, P271 Moist Air Slide Rule (Tabai), P280, P281, P283, P33/SS, P35, P36, P36S, P37 Sales, P402, P403, P45D, P45K, Real Estate Slide Rule Hemmi as it looks TODAY, CLICK to see what they make now! 
Hemmi/Sun Slide Rules Skip the INTRO, Go RIGHT to the Archive! Hemmi Bamboo Slide Rule Manufacturing Company Ltd. (Hemmi Keisanjaku) in Japan produced a wide range of slide rules under their own SUN logo, and for makers around the world, including the famous POST Versalog, which can be seen here in its original Model 258 form. Hemmi made most of POST's rules from the 1930's on (except for a period during the second world war), rules for Lietz, and rules for Canada's HughesOwens and Geotec. Visual comparisons and country of origin markings also suggest they may have made plastic body rules for SteadtlerMars, Sterling and Dietzgen. Hemmi rules have a very distinctive style, with engraved and filled scales. They are very robust as a result, and do not wear out easily. Many of their rules that are more than 5070 years old are still in wide circulation, and are still completely readable and work perfectly. Most of their rules have bamboo bodies, with laminated white celluloid scale faces. The unique nonwarping and selflubricating nature of bamboo, made these rules extremely popular, and long wearing. Hemmi later made plastic body rules (part numbers generally begin with P) which are also of very high quality, and were rebranded and sold by others outside of Japan. The Hemmi duplex cursor is an excellent design, and largely selfaligning, unlike virtually all other makes. Hemmi's slide rule designs always had many small features that were both ingenious and useful, making the rules a delight to use. When the full size rule number is followed by an 'L', it means the rule is provided in a leather case, otherwise it came in a two part hardboard case. Pocket rules normally came in a small leather case. Plastic body rules came in a two part plastic case. Hemmi made rules for many special purposes, including civil engineering/surveying, chemical engineering, electronics, physics and mechanical engineering. Their special purpose rules, like the 266 electronics rule and 257L chemical rule are some of the best ever made, and are still highly sought after today as working rules. Their designs were very practical, and unlike north american makers, self documenting as much as possible in later plastic body designs, making them far easier to understand and use. Compared to the Pickett N16 for example (the rule Pickett promoted as an electronics rule), the Hemmi 266 is far easier to use, has many more useful electronic functions, and does a much better job of decimal keeping in the answers and set up. Many people did not realize how many rules were actually made by Hemmi in Japan, as they did not market in north america under their own name. The very popular POST Versalog (1460) was often thought of as an American product. In reality, they were special Hemmi 258 (a 259 derivative) series duplex rules, and the pocket Versalog (1461) was a modified Hemmi 149A rule. During and after the second world war, Japanese products were not popular in the USA, and Hemmi was content to remain a background player, and continued to market via POST, Geotec and HughesOwens among others. Even after POST was taken over by Teledyne at the end of POST's operations, both the bamboo and plastic rules continued to be made by Hemmi in Japan. Hemmi's plastic body rules often had striking color accents, with blue or green tinted slides and end braces with white bodies. Unlike some other makers, their plastic rules were as good in terms of craftsmanship and appearance as their bamboo body rules, and were often very complex designs. Hemmi still exists today in Japan, but makes hydraulic valves and related industrial products, still under the same name. They no longer make slide rules, but do have some old stock that can still be bought. Thanks to Mark Fletcher, we now have full details of Hemmi's 1958 sales catalog, which describes all their major rules and features in illustrated form. CLICK HERE to see Bill Lise's wonderful Japanese Rule site, which includes many interesting Hemmi tidbits. To see a complete detailed operating Guide from Hemmi (for the 257 Chemical Rule, CLICK HERE. This covers general Log Log duplex rule operation, and the specialized chemical scales. To see Hemmi's own CARE INSTRUCTIONS FOR BAMBOO RULES, CLICK HERE. 
Hemmi/Sun Pocket Mannheim 30 CLICK for BIGGER PIC 
Pocket Miniature Mannheim Rule Beautiful 4" miniature bamboo rule with magnifying cursor, complete with leather case, and full manual. Has an inch scale side ruler, overrange scale extensions, regular cursor, reversible slide with 3 additional scales and rear cursor window. Very uncommon rule in North America. This rule has several variations, mainly related to the cursor construction, the rule shown is very late production. Same as the 32, but with regular cursor. (8 Scales and 4 inch side ruler) Front  A, [ B, CI C, ] D Reverse  [ S, L, T ] 
Hemmi/Sun Pocket Rietz 32 
Pocket Miniature Mannheim Rule Beautiful 4" miniature bamboo rule with magnifying cursor, complete with leather case, and full manual. Has an inch scale side ruler, overrange scale extensions, unbreakable plastic magnifying cursor, reversible slide with 3 additional scales and rear cursor window. Very uncommon rule in North America. This rule has several variations, mainly related to the cursor construction, the rule shown is very late production. Similar to the POST 1441 (which noramlly had a glass framed magnifying cursor), also made by Hemmi. (8 Scales and 4 inch side ruler) Front  A, [ B, CI C, ] D Reverse  [ S, L, T ] 
Hemmi/Sun P50 Basic Student 10" Simplex Rule CLICK for BIGGER PIC CLICK for BIGGER PIC 
10" Basic Student Simplex Slide Rule Low cost white plastic rule with black vinyl sleeve case case and instruction sheet. Interesting divide/multiply scale identification on left side of C/CI scales. Unbreakable plastic cursor. 
Hemmi/Sun 10" Mannheim 64 
10" Rietz Rule 10" Rietz format bamboo rule in the old style (undocumented scales) Hemmi format, complete with 2 part hardboard case, and full manual. Has an inch scale side ruler, overrange scale extensions, framed glass cursor, reversible slide with 3 additional scales and rear cursor window. The 74 is the pocket sized version of this rule. Very uncommon rule in North America. (10 Scales and 10 inch side ruler) 
Hemmi/Sun 6" Mannheim 66 
6" Rietz Rule 6" pocket Rietz format bamboo rule in the old style (undocumented scales) Hemmi format, complete with 2 part leather case, and full manual. Has an inch scale side ruler, overrange scale extensions, framed glass cursor, reversible slide with 3 additional scales and rear cursor window. The 64 is the full sized version of this rule. Very uncommon rule in North America. (10 Scales and 10 inch side ruler) 
Hemmi/Sun Pocket Mannheim 74 CLICK for BIGGER PIC 
Pocket Mannheim Rule Beautiful 5" miniature bamboo rule in the old style (undocumented scales) Hemmi format, complete with leather case, and full manual. Has an inch scale side ruler, overrange scale extensions, unbreakable plastic 3 line cursor, reversible slide with 3 additional scales and rear cursor window. Very uncommon rule in North America. (10 Scales and 5 inch side ruler) 
Hemmi/Sun 10" Log Log 130W CLICK for BIGGER PIC CLICK for BIGGER PIC 
12" / 10" wide body Log Log Slide Rule Bamboo rule shown with with Hemmi factory box, hard case, and manual. Very unusual rule and scale arrangement, it has 4 loglog scales on reverse, plus the P (pythagorean) scale, BI inverted scale and overrange scale extensions. Reverse also has equivalence and setting tables. A powerful and attractive rule, with 3 line plastic cursor, MINT condition! This is in the same large body frame style as the popular POST 1452W, and also has a cm scale on the sloped edge. (15 Scales, 1 Ruler) Front  cm, T, K, A, [ B, BI, CI, C, ] D, P, S Back  tables [ L, LL0, LL1, LL2, LL3 ] 
Hemmi/Sun 135 Miniature 5" Log Log Mannheim Rule CLICK for BIGGER PIC 
5" Advanced Slide Rule Miniature Log Log bamboo rule and leather case. Has inch scale side ruler, unbreakable plastic cursor with three lines, reversible slide with 4 additional Log Log scales and rear cursor window. A very attractive rule, with more advanced scales (ABCD include overrange extensions!) than typically found on small rules, including the P pythagorean scale. Very uncommon rule in North America. 
Hemmi/Sun 149A Log Log Duplex Pocket Rule CLICK for bigger PIC! CLICK for OTHER SIDE! 
6"/5"Pocket Slide Rule Bamboo, Log Log Duplex rule, metal framed glass cursor. This is Hemmi's original pocket duplex rule that was later released with a different scale organization as the POST 1461 versalog. These have blue and red scale markings, with adjustable end braces and cursor. Three minor variations are known to exist of the POST versalog version of this rule, and include a version with green scale markings for COS angles. These are wonderful lightweight rules with extraordinary computing power.
(22 Scales) 
Hemmi/Sun 153 Vector/Hyperbolic 10" Duplex Rule 
10" Vector/Hyperbolic Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces, slightly smaller body height than 260 series rules. For electronics use, vector and hyperbolic scales. 
Hemmi/Sun 154 Vector/Hyperbolic 20" Duplex Rule 
20" Vector/Hyperbolic Duplex Slide Rule
Extended size duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces, slightly smaller body height than 260 series rules. For electronics use, vector and hyperbolic scales. 
Hemmi/Sun 250 General Purpose 10" Duplex Rule 
10" General Purpose Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces, slightly smaller body height than 260 series rules. Folded scales (DF, CF, CIF) at the square root of 10, and DI scale is included on the body. 
Hemmi/Sun 251 General Purpose/Mechanical 10" Duplex Rule 
10" General Purpose/Mechanical Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces, slightly smaller body height than 260 series rules. Folded scales (DF, CF, CIF) at pi, and DI scale is included on the body. 
Hemmi/Sun P253 Vectorlog 10" Duplex Rule 
10" Vectorlog Duplex Slide Rule
Duplex plastic body rule and clear display case, with full manual. Similar construction to the P261/262, but body and slide are the same color. Two color scales and unbreakable cursor, with green end braces. Interesting folded scales (DF, CF, CIF) include both pi and the square root of 10, and DI scale is included on the body. 
Hemmi/Sun 255 Electrical/Hyperbolic 10" Duplex Rule 
10" Electrical/Hyperbolic Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces. Has hyperbolic sine and tangent scales. Folded scales (DF, CF, CIF) at pi. 
Hemmi/Sun 256 Electronic 10" Duplex Rule Click for bigger PIC! Click for bigger PIC! 
10" Electronic Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces. Has dedicated electronic scales. Folded scales (DF, CF, CIF) at pi. 
Hemmi/Sun 257 Chemical Engineering 10" Duplex Rules CLICK for BIGGER PIC 
10" Advanced Chemical Engineering Duplex Slide Rule
Powerful and classic Bamboo duplex rule, with Hemmi leather case. These rules were not seen in North America very often (too bad), but provide a wealth of specialized chemical computing power, including atomic weight, temperature and pressure calculations, plus a full function log log rule on the reverse. Very impressive rule, and quite uncommon. 
Hemmi/Sun 258 Versalog 10" Duplex Rule CLICK HERE For Bigger View

10" Versalog Duplex Slide Rule This is the mysterious transitional rule that existed for only a brief period as the Hemmi 258, them became the POST/HughesOwens Versalog rule. This is one of only two examples I know of that are dual marked, and is the HughesOwens 1777 version of the Versalog. Duplex bamboo body rule, leather case, with full hard cover manual. White celluloid scales, adjustable end braces. Has full log log scales. Folded scales (DF, CF, CIF) at pi.The date of this rule model's introduction appears to be circa 1951, based on the manual copyright date. (23 Scales) Front  LL0, LL/0, K, DF, [ CF, CIF, CI, C, ] D, R1, R2, L Reverse  LL/1, LL/2, LL/3, [ T, ST, S, C, ] D, LL3, LL2, LL1 
Hemmi/Sun 259D Expert Mechanical 10" Duplex Rule 
10" Expert Mechanical Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case or leather case, with full manual. White celluloid scales, adjustable end braces. Has full log log scales. Folded scales (DF, CF, CIF) at pi. 
Hemmi/Sun 260 Advanced Mechanical 10" Duplex Rule 
10" Advanced Mechanical Duplex Slide Rule
Duplex bamboo body rule, 2 part hardboard case or leather case, with full manual. White celluloid scales, adjustable end braces. Has full log log scales and a P (Pythagorean) scale, plus DI. Scales are selfdocumenting on the right hand side of the rule face. Folded scales (DF, CF, CIF) at pi. 
Hemmi/Sun P261 Engineering 10"Duplex Rule CLICK for BIGGER PIC CLICK for REAR VIEW 
10" Advanced Engineering Duplex Slide Rule Beautiful two color rule with twopart hard caseand full manual. Plastic body rule with unusual blue tinted slide and two color scales. Optimized to prevent offscale readings, the rule includes DF, CF and CIF pi folded scales. A BI scale is employed in parallel with the CI scale to allow single setting operations for multiplication or division of squares or square root. The T and S scales have complimentary angles marked in red. With the P scale, cos theta and the square root of 1X squared can also be calculated. The very wide Log Log scale range supports exponent calculations from 0.00005 to 22,000. The rule is also self documenting, with functions for each scale shown at the right hand side of the rule. A powerful rule, in a very attractive physical format from Hemmi, and one of their last and best designs. Unbreakable plastic cursor. 
Hemmi/Sun P262 Engineering 10"Duplex Rule CLICK for BIGGER PIC CLICK for REAR VIEW 
10" Advanced Engineering Duplex Slide Rule
Beautiful two color rule with twopart hard case, and full manual. Plastic body rule with unusual blue tinted slide and two color scales. Optimized to prevent offscale readings, the rule includes DF, CF and CIF pi folded scales. Dual Root (R1, R2) scales and dual Tangent scales (T1, T2) are provided for enhanced accuracy. Uses the Darmstadt system, with the T and S scales on the body with complimentary angles marked in red. The rule is also self documenting, with functions for each scale shown at the right hand side of the rule. A powerful rule, in a very attractive physical format from Hemmi, and one of their last and best designs. Unbreakable plastic cursor. 
Hemmi/Sun 266 Electronic Engineering 10" Duplex Rules CLICK for BIGGER PIC 
10" Advanced Electronic Engineering Duplex Slide Rule
Powerful and classic Bamboo duplex rule with Hemmi 2 part hard case, complete with manual. These rules were not seen in North America very often (REALLY too bad), but provide a wealth of specialized electronic calculations, including dB, Xc, XL, Frequency, impedance, wavelength, and a full function log log rule on the reverse. Very impressive rule, with selfdocumenting scales and quite uncommon. Dual marked scales for some functions. 
Hemmi/Sun 269 Civil Engineering 10" Duplex Rule CLICK for BIGGER PIC 
12" / 10" Advanced Civil Engineering Duplex Slide Rule
Powerful and classic Bamboo duplex rule with 2 part hard case, complete with the manual. These rules were also not seen in North America very often (too bad), but provide a wealth of specialized trig/survey calculations, including triangle solutions, stadia and curve setting calculations, hydraulics and water head. Very impressive rule, with selfdocumenting scales and quite uncommon. 
Hemmi/Sun 275 Electrical/Hyperbolic 20" Duplex Rule 
20" Electrical/Hyperbolic Duplex Slide Rule
Extended size duplex bamboo body rule, 2 part hardboard case case, with full manual. Capable of higher accuracy due to increased scale length. White celluloid scales, adjustable end braces. Has hyperbolic sine and tangent scales. Folded scales (DF, CF, CIF) at pi. 
Hemmi/Sun 279 Expert Mechanical 20" Duplex Rule 
20" Expert Mechanical Duplex Slide Rule
Extended size duplex bamboo body rule, 2 part hardboard case case, with full manual. White celluloid scales, adjustable end braces. Capable of higher accuracy due to increased scale length. Has full log log scales. Folded scales (DF, CF, CIF) at pi. 
Hemmi/Sun P280 Student Log Log 10" Simplex Rule CLICK for BIGGER PIC CLICK for BIGGER PIC CLICK for BIGGER PIC 
10" Student Simplex Slide Rule Beautiful low cost two color rule with twopart hard case and full manual. Plastic body rule with unusual blue tinted slide and two color scales. Basic student rule with trig scales, the T, ST and S scales have complimentary angles marked in red, and the scales are all selfdocumenting on the right hand side. Reversable slide has 3 log log scales. Unbreakable plastic cursor. 
Hemmi/Sun P283 Student Log Log 10" Simplex Rule CLICK for BIGGER PIC CLICK for BIGGER PIC CLICK for BIGGER PIC 
10" Student Simplex Slide Rule Beautiful low cost two color rule with twopart hard case and full manual. Plastic body rule with unusual blue tinted slide and two color scales. Basic student rule with folded and basic trig scales, the T, and S scales have complimentary angles marked in red, and the scales are all selfdocumenting on the right hand side. Reversable slide has 3 log log scales. Unbreakable plastic cursor. 
Hemmi/Sun 410 Gear 10" Duplex Rule CLICK for bigger PIC! CLICK for bigger PIC! 
10" Gear Design Duplex Slide Rule
Full size duplex bamboo body rule, 2 part hardboard case case. Unusual trig scales and factors, presumably meaningful something to do with gear cutting. White celluloid scales, adjustable end braces. 
Hemmi/Sun Circular 1001 CLICK for BIGGER PIC! 
Pocket Square/Circular Rule A compact 75mm/3 inch pocket square body, circular scale slide rule, with an unusual blue/green body scale, and a white rotating scale with finger grips along the outside edge. Virtually unknown here in North America, this Hemmi circular rule is very attractive and functional, with a very striking blue/green color scheme. Constructed of several layers of plastic, overlaid and riveted in the corners. This is a simple lightweight pocket rule, with performance equal to a much larger straight rule, blank on the rear. Came complete with vinyl case and manual. (5 Scales) 
Hemmi/Sun Circular 1002 CLICK for BIGGER PIC! 
Pocket Circular Rule A compact 75mm/3 inch pocket circular slide rule, with an unusual blue circular rotating scale. Virtually unknown here in North America, this Hemmi plastic circular rule is very attractive and functional, with a very striking blue color scheme. This is an attractive lightweight pocket rule, with performance equal to a much larger straight rule. Rotating cursor and disk, blank on the rear. Came complete with vinyl case and manual. (4 Scales) 
Hemmi/Sun 2634 Miniature 5" Mannheim Rule CLICK for BIGGER PIC 
5" Advanced Slide Rule
Beautiful miniature bamboo rule and leather case, in an original Hemmi box with full manual. Has inch scale side ruler, unbreakable plastic cursor, reversible slide with 4 additional scales and rear cursor window. A very attractive rule, with more scales (includes folded scales and enhanced trig scales) than typically found on small rules. Regrettably, these boxes all are slightly crumpled, and the manuals and/or boxes are slightly foxed. The rules are still sealed in factory bags, but need to be wiped down with a damp cloth to remove the years of storage oxidation. Rules and cases are still wonderful, and not to be missed! Very uncommon rule in North America. 
Hemmi/Sun 2690 Stadia 10" Mannheim Rule CLICK for BIGGER PIC 
10" Stadia Slide Rule
Beautiful Full size bamboo rule and two part hard case. Includes surveying (stadia) sincos and cos squared scales, and cm/inch rulers on the sides. Has additional trig scales on reverse, plus equivalence and setting tables. 
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