The Hemmi Catalogue Raisonne (both parts I and II) needs a new home.    I'd like someone to take it over and make it bilingual but there are no pre-conditions.  It does require a little work; a few time a year a collector corrects something or provides a better picture.  It's been a long time since anyone found a slide rule that's not already listed but I'm sure there are a few out there.   Contact me if you are interested.
Paul

Hemmi Slide Rule Catalogue Raisonne

Part II: Rules Without Known Model Numbers

This part of the Hemmi Catalogue Raisonne lists Hemmi-made slide rules for which I know no model number.  These rules were given names ("Calorie," Real Estate") instead of model numbers, or were made for other companies (SKF, Carrier, Foxboro) or made for the military.  There are also some rules which probably were assigned Hemmi model numbers but I don't know what that model number was--e.g., the 1938 "Astronavigation" rule.  I will be greatly indebted to anyone who can supply any more information about any Hemmi slide rule. 

As of March 2015, The Hemmi Slide Rule Company. Ltd was still in business in Tokyo.  They are engaged in development and manufacturing of printed circuit boards, fluid control devices, semiconductor manufacturing equipment and several minor businesses--one of which is the design and manufacture of custom slide rules of the style I would call a "slide chart."   Hemmi has not manufactured logarithmic slide rules since about 1975.   They have an English-language web site at https://www.hemmi-inc.co.jp/english/ .  The website states that Hemmi is
"currently manufacturing and selling the following specialty slide rules
    - Management calculation (management diagnosis, profit ratio)
    - Pollution calculation (flue gas diffusion, etc.)
    - Medical calculation (cardiothoracic ratio, lung function, infusion rate, etc.)
    - Calculation related to health (BMI check, calorie calculation, etc.)
    - Calculation related to aircrafts (load balance, etc.)
    - Architectural design calculation (building structural design, etc.)
    - Ductwork and fluid design calculation (air-conditioning system design, duct diameter, )"etc.  (See last item on this page for a photograph.) 

Descriptions here are arranged by type of construction.  Click to go directly to
    - Bamboo closed-body slide rules and similar devices     
    - Unknown construction from 1930s and 40s.  (Only name or function is known.)
    - All-plastic closed-body slide rules and similar devices
    - Devices made of folded paper or plastic sheeting
    - Miscellaneous devices
    - Duplex slide rules
    - Slide charts

Special thanks to D. Boone, Bill Lise, Atsushi Tomozawa, Hitoshi Nori and Wataru Tsuchihira for the help they have given.

Paul Ross

Bamboo and Celluloid Closed-Body Rules

SKF Bearing Rule, 1930s

Designed and distributed by SKF.  Implements various calculations related to bearings.  Table on back explains scales and formulas. ( Picture is modified from Herman van Herwijnen's Catalog.)

"System Haraguchi" Slide Rule for Weight/Volume Calculations of Metals. 1930s

Note unique "slide-within-a-slide" construction.  

Designed by Susumu Haraguchi.   The design first appeared in a 1925 book by the inventor.  I can't find any indication of a Hemmi model number for this rule but it was listed as item number 4496 in the 1932 Tamaya catalog.  It was also shown (without a model number) in a 1930s Hemmi Japanese language general instruction manual.  In those sources the rule was shown with an earlier "frameless" cursor.  (The same illustration was used in both sources.)  

Photo, and most of this information, from Hitoshi Nori.  Nori estimates the dates of availability as 1930s to WWII.

Matsuda Tube Waterways Rule, 1930s - 1970s

Ooiso Calorie Rule, 1930s

There is an article about this rule dated 1939 (by Mr.Toshio Ooiso).   I think this is a Calorie Slide Rule referred in "Development History of the Slide Rule" by Jisuke Miyazaki. There are instructions on conversion table on back (in Japanese).  

This rule is quite rare; I am indebted to Wataru Tsuchihira for the picture and information.

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Ratio Rule, 1938

The only known example of this rule is owned by Keiji Nakamura.  The photograph is from his blog at   https://knak69.blogspot.com/2023/03/hemmi-fishprice-and-ratio-rules.html.   Construction is celluloid on bamboo.  The rule is designed to calculate three ratios: Body Weight / Height,  Chest Circumference / Height, and Sitting Height  / Height.  

Conversion Slide Rule, Pre WWII

250 x 34 mm.  The pictures are from a Japanese auction which ended February 5, 2008.  Here is  Atsushi Tomozawa's explanation of the scales: "The scales are captioned (from top to bottom) Year(G), Month(E), Month (F), Reverse(CI), Day(C), Day(D).  The gauge marks on M scale are various units of length and area, some Japanese and some European. It appears that this rule is designed especially for unit conversion."  I can find no Hemmi documentation of this rule.

Artillery Rule, 1942

 

 Jihei Miyazaki [Development History of the Slide Rule, May 1956] and Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no. 2, August 1992.] both list an "Artillery" rule as being introduced in 1942.  The rule pictured here belongs to D. Boone.  It came in a box marked "Artillery" and "Science School #215;" its identification as the Artillery Rule of 1942 is tentative but the style of writing on the box definitely dates it before 1945.  Scales on the pictured rule are: Upper slanted edge: Two linear scales 0-10 and 600-0.  Face:  L1, DF [CF, L2-L1, CI, C] D, A.  Bottom edge: 0-20 cm. Body rear: 0-200 linear and 5 - infinity reciprocal. Slide rear: T1, T2, S2, S1.  Trig functions seem to use a system wherein 1600 units equal 90 degrees.

See also LOGA 6400 below.

Nishiki,  1942

Top, slanted edge carries a 0-50 cm scale.  All four scales on face of rule are identically divided linear scales (0.4 mm per unit) which means the rule is for addition and subtraction--not multiplication and division.  Scale on upper stator is 200 - 0 -200, 160 mm long in center of rule.  Upper scale on slide is 0 - 500, 200 mm long at left end of slide.  Lower scale on slide is linear 100 - 1350 offset by 50 units from upper scale on slide.  (Total length 500 mm)  Scale on lower stator is same as scale on upper stator except placed at right end of rule.  Hairline on left cursor extends over upper two scales only; hairline on right cursor extends over lower two scales only.  Face width 34 mm.

Triangulation Rule, ca 1940

This 50-cm rule has only one magnifying cursor; the picture shows two cursors because it is stitched together from two scans.  Function of rule is unknown; "triangulation" is just a guess.  I suspect it may be the Altitude Correction/Height Adjustment Rule above but my friend Atsushi Tomozawa suspects it was used by airplane navigators or for aerial surveying.

Front scales are e [L, N^1/3, N^1/2, T, N] X and a partial-length unlabeled scale below the X scale.  The e, N, and X scales are three-cycle logarithmic: e runs from 10cm to 100m, N and X run from 1 to 1000.  The N^1/3 and N^1/2 scales are the cube and square roots of the N (and X) scale.  The N (X) scale gives the tangent of angles which are engraved on the right end of the N^1/2 scale and the full length of the T scale.  The range of angles is 6^o to 89^o57'.  (Compare to usual range of 6^o to 45^o.)  The unlabeled scale on the bottom of the rule is marked 1' to 17'; each graduation is 1/60 of the graduation on the X scale.

There are three scales on the back of the slide: S ranges from 500m to 20km; log S ranges from 2.7 to 4.3; a ranges from 3' to 90^o.

There are several tables of formulas on the back.  The following is a paraphrase of Tomozawa'a explanation of those tables: One is definitely related to distance (height) estimation using triangulation.  The second table consists of triangle formulas.  The third table contains three items: (1) Indirect method of level estimation;  (2) Level measurement by barometer;  (3) Earth parameters.  The fourth and fifth tables are related to map reading.  The sixth set of formulas is titled "Westward inclination of earth magnetic field."  Seventh: (1) Formulas for photographic surveying; (2) Angle conversion factors.  Eighth table contains various constants such as 1 mile = 1,609 meter.

Picture provided by D. Boone.

"Byoutou," 1944

//Closed body||.  250 x 34 x 11 mm.  (Same body as Hemmi 50W.)  Calculating scales on four surfaces (front, back of slide, top slanted edge, and bottom vertical edge).    Top, slanted edge carries a non-linear scale labeled "V" near left end and a 0 - 10 cm scale at right end. Face of rule carries eight full-length non-linear scales labeled simply (1) - (8).   Bottom edge of rule carries non-linear scales (9) and (10).  Labels (11), (12) and (13) appear at the right ends of scales (2), (3) and (6).  Labels (14) and (15) appear at the right ends of scales (6) and (5) but upside down--as if the user were to reverse the rule when using them.  Non-linear scales (16), (17) and (18) are on the back of the slide.  Special cursor with flexible tab extending from top edge; cursor must be reversed when using scales on bottom edge of rule.  It is possible that some operations were to be performed with the rule upside down, with the slanted edge toward the bottom.  There is a plastic table on the back with settings for the C and D scales and trigonometry formulas; none of which seems to relate to this slide rule.

The following information is from Atsushi Tomozawa:  The name "Byou-tou" comes from two Chinese characters "byou" and "tou" on a box containing a specimen of this rule in the Hemmi Offices in Tokyo.  The first character translates to sprout, bud or shoot of a young plant; the second means "head."  "Shooting Heading" is not an impossible translation.  "Development History of the Slide Rule" by Jihei Miyazaki states that the Byoutou rule was introduced in 1944 but does not mention what function the rule served.  Another book, "History of the Slide Rule," written for the Royal Navy Military Schools in 1944 explains how to use the rule to calculate a correction angle for firing at moving ships; the corrected angle is called "corrected byoutou."

It is possible that this rule is an improved version of the Artillery Rule of 1942, above.

These rules are relatively common but cursor is usually missing.

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6400 A^o/oo Topo (Swiss Army Artillery Rule) 1952
This slide rule is mentioned in conjunction with the well-known LOGA TOPO 6400 A^o/oo circular stadia rule in a Swiss army publication "Instruments for Measuring and Observation in the Artillery" published 1952.  The label on the slide reads "6400 A^o/oo Topo" which implies that the rule was intended for use in conjunction with the Loga rule. The pictured specimen is in the Swiss Army Museum.  (Information from Jacques Perregaux, photo courtesy of Stiftung HAM, Thun, Switzerland, www. stiftung-ham.ch.)

CJ-805-3B Engine Performance, 1967

GE jet engine CJ-805 powered the Convair 880 and Convair 990 airliners.  The pictured rule belongs to D. Boone; date code is "RD."

Meteorological Slide Rule?

eBay auction  6248834536, Feb-05-06 .  Won by "Waynesworld."  Here is the seller's description:
"A 10 inch bamboo base Sun Hemmi rule, no model number, and not listed in the catalogs available. The face scales are: Pressure in mmHg, B, CI, Height(same as C scale) ABS Temp (-50 to +200 C). The reverse side scales are: Height in Km, Pot. Temp. Coef. (mmHg.mb), and Temp. Fact. (-60 to +40 C). The rule has a 10 inch scale on the lower edge and a 0-27cm scale on the upper edge.  Possibly used for barometric calculations and other meteorological purposes."

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Carrier Ductuler (Bamboo), 1961.

Bamboo and celluloid.   For design of air conditioning ducts.  Date code "LC" = March 1961.  Predecessor to the all-plastic Carrier Ductuler. (See section on  all-plastic rules below.)

Unknown Materials

This section lists rules mentioned in various non-Hemmi sources.  They may not actually exist.  The original source may be in error or I may have misunderstood what was being described or Hemmi may have changed their minds before actually producing them.  If they existed they were probably closed-body rules made of bamboo and celluloid similar to the devices listed above.

Astronavigation Rule, 1938

Jihei Miyazaki [Development History of the Slide Rule, May 1956] and Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no 2, August 1992.] both list an "Astronavigation" rule as being introduced in in 1938.

Ratio/Percentage Rule, 1939

Jihei Miyazaki [Development History of the Slide Rule, May 1956] lists a "Ratio" rule as having been introduced in 1939.  Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no 2, August 1992.] translates the same item as "Percentage" rule.

Air Navigation Rule, 1939

Jihei Miyazaki [Development History of the Slide Rule, May 1956] and Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no. 2, August 1992.] list an "Air navigation" or "Navigation" rule as being introduced in in 1939.  Both list it in addition to the 1938 Astronavigation rule, above.

Communications Engineering Rule, 1939

Hideaki Hirano, in his book titled "History of the Slide rule Development,” gives the date for this rule as 1939.  Jihei Miyazaki [Development History of the Slide Rule, May 1956] and Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no. 2, August 1992.] both list a "Communications Engineering" rule as being introduced in 1943.  It is not impossible that rule shown as Hemmi model 120 MIGHT in the Hemmi Catalogue Raisonne, Part I, is, in fact, this Communications Engineering Rule.

Merchant's Slide Rule

400 mm x _.   The only information I have on this rule is the name from Bill Lise.  

Altitude Correction/Height Adjustment Rule, 1943

Jihei Miyazaki [Development History of the Slide Rule, May 1956] lists an "Altitude Correction" rule as having been introduced in 1943.   Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no. 2, August 1992.] translates the same item as "Height Adjustment."

Transmission Rule, 1943

Jihei Miyazaki [Development History of the Slide Rule, May 1956] and Katsunori Kadokura [Chronology of Japanese Slide Rules, Journal of the Oughtred Society, vol. 1, no. 2, August 1992.] both list a "Transmission" rule as being introduced in in 1943.

Power Load Rule, 1955

Jihei Miyazaki [Development History of the Slide Rule, May 1956] says a "Power Load Rule" was developed in 1955 for Kyushu Electric Co

All-Plastic Closed Body

YS-11M-A Aircraft Load Adjusting Rule  1964-74

||Closed body|| All-plastic.  English language.  Load adjuster for NAMC (Nihon Aircraft Manufacturing Co.) YS-11 twin-engine turbo prop.  Plane was manufactured from 1964 to 1974; rule presumably dates from that period.   Picture copyright by Bill Lise.

Real Estate, 1964

All-plastic ||closed body|| in two sizes: 200 x 28 x 5 mm and 120 x 25 x 3 mm. Front scales: To, m² [Ken, m]  m, Ken.  Rear scales: Blank.  Japanese language.  Known date codes OJ, OK.   Instructions printed 1965.

Carrier Ductuler (All-Plastic), 1965

All-plastic ||closed body|| 200 x 28 x 5 mm.   For design of air conditioning ducts.  Probably predecessor to Hemmi model P141.  Date code of rule shown is "PC" = March 1965.

There was an earlier bamboo version of this rule.  See the "Carrier Ductuler (Bamboo)" in the "Bamboo and Celluloid Rules" section of this Catalogue II.

Yazaki Aroquicker,  1967

Yazaki Corporation is a diversified manufacturer of  gas, air conditioning and solar equipment.   I don't have any idea what this slide rule calculates.  Date code "RH" = August 1967.  Photo supplied by Wartaru Tsuchihira.   

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Electrician's Rule, ca 1965

12.5-cm all-plastic closed body.    Scales seem to be oriented toward selection of wire gauge and calculation of voltage drop and power loss.   Rear of slide carries three scales.  Possibly same as Power Load Rule (1955) described above.
Picture courtesy D. Boone; the rule carries no date code.

Accumulator Slide Rule

An accumulator seems to be a device for "storing" hydraulic pressure.  Manual is in English and Japanese.  Pictures and information courtesy D. Boone.

Hydraulic Rule,  1967-1975

There are at least two versions of this slide rule.  The earlier version is celluloid on bamboo.  The specimen shown here is dated "RH" (August 1967).

 
Click on picture to enlarge.


  All information from Wataru Tuschihira who owns the specimens pictured. 

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Hydraulic Flow Rule 1971

Another hydraulic flow rule from Hemmi.  This specimen is dated "VG" (July 1971).  Front of rule (upper picture) implements the Hazen and Williams formula; rear (lower picture) implements the Manning System.  The specimen pictured belongs to Wataru Tsuchihira.

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Dr Won's Hydraulic Slide Rule

Yokohama Kogyo Sekkei / Hemmi Flow Rules, 1972-73

There are two versions of this slide rule.  The scales on the longer rule have an unusual length of 278 mm (10.9 in) whereas the scales on the shorter rule are the common 125mm (4.9 in).    Both specimens shown here are owned by Wataru Tsuchihira who kindly provided the picture.  The previous owner told him that the shorter rule was a promotional give-away from a company which designs wastewater system.  The shorter rule has manufacturing date code "WK" (November 1972); the longer "XD" (April 1973).

Body Weight Balance, 1972

200 x 28 mm (same blank as Hemmi P45D, P45K, P45S).  Listed in a 1972 Japanese language flyer.  Calculates "obesity" (similar to body mass index, BMI?), "Raurel Index," and "Carp Index" based on student's weight and height.  Brochure specifically uses the word "student."

Diver's Decompression Slide Rule, 2004

||Closed body||  200 x 32 x 4.3 mm.  All-plastic.  (Same blank as Hemmi P135k.)  Custom manufactured by Hemmi ca 2004.  The pictured specimen was given to a group of Japanese slide rule collectors as an example of Hemmi's recent production; it is presently in the possession of Mr. Nori.  Two of the phrases in red translate to "Body gas pressure" and  "Dive depth;" I think it calculates decompression times for divers.

Lung Ventilation Calculator, 2010?

This device was sold on Yahoo Japan in May 2019.  Used to calculate lung function.  ("Rifadin" is an antibiotic used to treat tuberculosis and other deseases.)  Construction is similar to other Hemmi rules known to be manufactured in early 21st century.  

Thanks to Cliff Frohlich for bringing  this to my attention.



Click on picture to enlarge it.

Cardiothoracic Ratio Calculator, 2015?

Click on picture to enlarge it. 

||Closed body||  200 x 32 x 4.3 mm.  All-plastic.  (Same blank as Hemmi P135k and Diver's Decompression Slide Rule above)  I think this was a current Hemmi product in 2015.  Picture supplied by Wataru Tsuchihira.  Inset detail shows one of the springs which hold the slide in place.

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Heart/Chest Rule  2018?


Transparent rule at top of picture is used to measure heart and chest dimensions on x-ray.  Instruction are in Japanese.  Photo and information from Cliff Frohlich.

Gas Calibration Rule

Sawa's Exposure Reckoner  A R S,  1936

Paper slide rule for calculating photographic exposures.  Physical construction almost identical to Hemmi model 46.  Instruction Manual dated 1936.  "Sawa's Exposure Reckoner A R S" in English on box and case but pretty much everything else is in Japanese.  Photo and information courtesy Wataru Tsuchihira.

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IJN 98 (Imperial Japanese Navy Maneuvering Rule, Type 98), 1938-43

Handheld device for naval gunnery calculations.  Type 98 means "type approved in imperial year 2598" (1938).   

Left photo is from a June 2005 auction on Yahoo! Japan; right photo is from an August 2014 auction on TradeMe (New Zealand).  Information is from Bill Lise who examined a museum specimen dated 1943 on its back.

Jitsumu Kyouiku Kenkyujo

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Miscellaneous Devices

Slide Projector Slide Rule, 1940s

Labeled "SUN HEMMI 'Projection Slide Rule (4)' (for simplex)".  Manufactured by "NIHON KOGEI CO., LTD" for use with lantern slide projectors which were popular for technical presentation in the 1940s and 50s.  Scales are identical to Hemmi model 2662.  Three sheets are superimposed: (1) Scales on face of rule, (2) Scales on rear of slide, (3) cursor.  More modern projection slide rules for overhead projectors use the same three sheets.

Picture and all information courtesy Hitoshi Nori.

Planisphere (1940s)

Based on Kanji characters used and how domestic Japan is referred to in the instructions on back, Wataru Tsuchihira thinks this planisphere was designed before end of World War II.   He has also found references to it from as late as 1949.

In 1976 Hemmi teamed with Brother Industries to produce a a line of electronic calculators.  There were four models: Versor 804, 814, 824 and 834.  (The pictured calculator is marked "Hemmi Versor 824.")  This information is from Hitoshi Nori who is not aware of any specimens in existence in 2009.

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MR80 Electronic Calculator


This device is owned by Wataru Tusuchihira who says it is working fine in June 2017.  Manufactured by Brother as model 508AY.  

PressMate, Late 1980s?

 Duplex Slide Rules  

Pocket Versalog, ca 1957 - 68

Manufactured by Hemmi for the Frederick Post Co. of Chicago (Post model number 1461) and for the Hughes Owens Co. of Canada (Geotec 341 3050).  Same scales as full-size Versalog (See Hemmi 258): LL0, LL/0, K, DF [CF, CIF, CI, C]  D, R1, R2, L  and LL/1, LL/2, LL/3 [T T, SecT ST, Cos S, C] D, LL3, LL2, LL1.   125 x 34 x 3.5 mm.

On both full-size and pocket Versalogs, the COS  scale was in navy blue until 1960 when the color changed to green.  The earlier rules are generally identified as models IA, the latter as models IB.    

Replaced by Pocket Versalog II (same model numbers) in November 1968.

Versatrig 1960 -

Manufactured by Hemmi as a cheaper version of the Post Versalog Slide Rule.  Post Catalog Number 1450 until ca 1972 after which it became Teledyne-Post 44CA-500.  Sold in Canada as Geotec 341 3120.  Available from about 1960 (Instructions copyright 1961) but did not appear in Post Catalogs until 1969.   Scales K, DF [CF, CIF, CI, C]  D, R1, R2 and L, A [T T, SecT ST, Cos S, C] D, DI.  250 mm x 1-5/8 x 1/4 inch.

Pocket Electronics Rule

125 x 38 x 3 mm all-plastic closed body.  The pictured rule carries no date code.

SMC Pneumatics Slide Rule,  ca 1965-67

Plastic duplex.  250 x 46 x 5 mm, same blank as Hemmi P261, P262 which were made ca 1965-67. 

 Foxboro Flow and Valve Rule, 1967

Plastic duplex.  250 x 46 x 5 mm.  No date code but instructions are copyright 1967.    No mention of Hemmi except "Hemmi Japan" embossed into cursor.  There are two versions of this rule: "English Units" (upper picture) and "Metric Units" (lower picture.)

Yokogawa/Foxboro Flow and Valve Rule, 1967

Identical to Foxboro Flow and Valve Rule (metric version) except "@SUN@ HEMMI JAPAN" and "YEW" (Yokogawa Electric Works) in box added to left end of rule.  Date code "RJ" (October 1967) on rule and "6809" (September 1968) on rear cover of Instruction book.

This specimen and it's instruction book belong to Wataru Tsuchihira.

Metal-Chemistry Rule I, 1967

Duplex, 500 mm x 1-3/4 x 1/4 in. Front scales: L, K, A, DF [CF, CIF, CI, C]  D^oK, LL3, LL2, LL1  Folded at p. Rear scales: Ch A~M, Ch N~Z, M1, Xw [X, M2, T^oF, T^oC, T^oK]  Patm, PmmHg, T^ow, G.

This rule belongs to D. Boone; it is the only specimen of this variant known to me.  It carries a date code of "RA."  See discussion of Metal-Chemistry Rule II below for additional information.

Metal-Chemistry Rule II, 1968-

Duplex, 500 mm x 1-3/4 x 1/4 in. Front scales: L, K, A, DF [CF, CIF, CI, C]  D^oK, LL3, LL2, LL1  Folded at p. Rear scales: Ch A~M, Ch N~Z, M1, Xw [X, M2, TI, SI, G]  Patm, PmmHg, T^oF, T^oC.

Two specimens of this rule are known; neither has a date code.  Atsushi Tomozawa purchased the rule pictured here along with a Japanese language instruction manual directly from Hemmi about 2004.  The Hemmi employees he dealt with identified it as a "Metal-Chemistry" rule.   (D. Boone owns the other specimen.)  Based upon its similarity to the Hemmi Chemistry rule (model 257L) it is possible that this rule was intended to be marketed as model 277 but no such model number appears in any known Hemmi documentation.

Versalog II, 1968 -

The original Versalog was the same as Hemmi model 258 and is described under that model number on the main page of this Catalogue Raisonne.  The Versalog II, introduced in November 1968, re-arranged the original Versalog scales and added an "A" scale.  Scales: LL/0, K, A, DF [CF, CIF, CI, C]  D, R1, R2, LL0 and L, LL/1, LL/2, LL/3 [T T, SecT SRT, Cos S, C]  D, LL3, LL2, LL1.  250 mm x 1-3/4 x 1/4 inch.  Sold in the United States by the Frederick Post Co. as model 1460 (Same number as original Versalog) until ca 1972 when it became Teledyne-Post model 44CA-600.  Sold in Canada by the Hughes Owens Co as Geotec model 341-3012.  Versalog IIs can be easily distinguished from original Versalogs by the presence of the "A" scale.

Pocket Versalog II, 1968 -

Same scales as full-size Versalog II.  125 x 34 x 3.5 mm.  Sold in the United States as Post model number 1461 until ca. 1972 when it became Teledyne-Post 44DA-610.  Sold in Canada as Geotec model 341-3052.

Manufactured by Hemmi for the Frederick Post Co. of Chicago (Post catalog number 1451) and the Hughes Owens Co of Canada (Geotec Model 341 3125).  Scales K, DF [CF, CIF, CI, C]  D, R1, R2 and L, A [T T, SecT ST, Cos S, C] D, DI (same as Versatrig).   125 x 34 x 3.5 mm.

Appeared in only one Post Catalog (1971).  All known Post specimens carry date code "SF" (June 1968) but the only Geotec specimen I'm aware of has date code "TE" (May 1969).

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Geotec 341-3670 All-Plastic Pocket Versalog II  (c 1975)

Click on image to enlarge.

Machine Tool Endurance Estimation Rule, 1967-68 (Homma Metal Works)

Click on picture to enlarge.

12.5-cm duplex--same body as Hemmi 149A except solid plastic.  Calculation of useful lifetime of bits used in metal turning lathes.  This specimen carries date code "RI" (August 1967).  The six Japanese characters on the rear upper right say "Designed by Mechanical Testing Laboratory." (Atsushi Tomozawa informs me that the Mechanical Testing Laboratory is now known as "National Institute of Advanced Industrial Science and Technology."
 

Thirty-page instruction manual, "How to Use the Machine Tools Endurance Estimating Rule," is all in Japanese.  Instruction manual is dated 1968.

This specimen is marked "Homma Metal Works" (In English) on the rear lower left. It has a brown leather case embosed with Homma trademark and ten Japanese characters on front plus Homma trademark and "HOMMA METAL WORKS CO., LTD." on back.  
 
There is also a Hemmi-made Homma Metal Works slide chart from about 1976.  See the section on Slide Charts below.  

Calorie, 1972

Plastic duplex.  250 x 46 x 5 mm. Described in same 1972 Japanese-language Hemmi brochure as the Body Weight Balance rule, above.  This picture is from Kim's Japanese website, http://www.tok2.com/home/kim/sliderule/Calorie.html  (which, unfortunately, seems no longer available).  Calculates basal metabolism and required calorie intake from height and weight.  "Calorie" is printed in English on face but the rule may not have been available with English instructions.

Sash Design Rule 1974

Same blank as Hemmi models P261, P262, P267.  The pictured specimen carries date code "YA" (January 1974).  It belongs to Wataru Tsuchihira.

Denkishoin Electrical Slide Rule, ca 1976

Plastic duplex.  250 x 46 x 5 mm, same blank as Hemmi P261, P262.   Rear scales are Tq₂, Tq₁, Sq, R₁ [R₂, B, CI, C]  D, SR, TR₁, TR₂.  This rule was advertised for sale in at least two 1976 issues of "Denki-Keisan," a magazine published by Denkishoin--a publisher of electrical books and manuals.  (Information from Hitoshi Nori.)  This specimen, which carries no date code, belongs to Atsushi Tomozawa who provided the picture.

Slide Charts

Duct Slide Chart

Current production as of March 2015.  Hemmi website description: "Ductwork and fluid design calculation (air-conditioning system design, duct diameter, etc.)."  Photo courtesy Wataru Tsuchihira.

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Weight Control Calculator  (Current production in 2015)

For more detail, right click on picture and choose "Save picture as" (Internet Explorer) or "Open image in new tab." (Chrome.)