The Slide Rule Trading Co., Paul Ross.

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 http://hemmi-inc.co.jp/english/slide_rule/index.html.  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

Click here to return to Part I of the Hemmi Catalogue Raisonne.

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




Implements "Hazen & Williams formula" for calculating pressure loss due to friction in pipes.    The picture shows a rule belonging to Wataru Tsuchihira.  Its date code is "UE" (May 1970).  


All-Plastic Tube Waterways Rule  (1970s?)


All-Plastic Tube Waterways

Same scales as bamboo rule above but body is same as all-plastic Hemmi P280, 281, 283 except for centimeter scale on top edge.  No date code.  Photo courtesy Wataru Tsuchihira.  (Click on picture to enlarge it.)



Ooiso Calorie Rule, 1930s


Click on picture to enlarge it.

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.

Ratio Rule, 1938



All we know about this slide rule comes from an instruction manual, dated 1938, owned by Wataru Tsuchihira.  Construction is celluloid on bamboo.  The rule is designed to calulate 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.

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, N1/3, N1/2, 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 N1/3 and N1/2 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 N1/2 scale and the full length of the T scale.  The range of angles is 6o to 89o57'.  (Compare to usual range of 6o to 45o.)  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 90o.

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.


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."


Carrier Ductuler (Bamboo), 1961.

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

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


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

Yazaki Corportion 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.   


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).





The later version is all-plastic.  The specimen shown here is dated "ZX" (March 1975).
 
For more detail, right click on picture and choose "Save picture as" (Internet Explorer) or "Open image in new tab." (Chrome.)


 Scale length for both of these rules is 180 mm.  
There are three logarithmic scales which run from 0.1 to 10,000 (five cycles).  

  All information from Wataru Tuschihira who owns the specimens pictured. 

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.

Dr Won's Hydraulic Slide Rule

Dr Won's Hydraulic Slide Rule
Click on picture to enlarge it.
This slide rule was sold on eBay  January 15, 2017 by "daboyryan"  for $213.50.  The only information provided by the seller was "This slide was invented by Prof. Dr Tae-Sang Won and is made for Pipe Lines."     I have not been able to get any information on Korean patent 1743 or Japanese patent 165131.

Yokohama Kogyo Sekkei / Hemmi Flow Rules, 1972-73

Click on picture to enlarge it.

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.



Cardiothoracic Ratio Calculator, 2015?


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

||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.


Gas Calibration Rule




Click on picture to enlarge it.
This specimen carries no date code but, judging from construction, it probably dates from the 1970s.  Back of slide is blank.  Pictures and information courtesy Wataru Tsuchihira.



Devices made of Folded Paper, Plastic Sheeting, etc


Sawa's Exposure Reckoner  A R S,  1936





Paper slide rule for calculating photographic exposures.  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.


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




An all-paper Hemmi slide rule discovered by Wataru Tsuchihira.  Scales are 150 mm long.  Back is blank except for "Jitsumu Kyouiku Kenkyujo" in Japanese characters.  The Hemmi logo in condensed black Arial type was used by Hemmi in the 1950s and 60s.  Jitsumu Kyouiku Kenkyujo is a foundation, still in business in 2015, offering various correspondence courses.  A reasonable surmise is that this slide rule was supplied to students.  (All information from Wataru Tsuchihira.)

Chu 1 Jidai Furuku  (1970)


Another all-paper Hemmi slide rule discovered by Wataru Tsuchihira.  Distributed with a magazine for first-year junior high school students in February 1970.  Identical construction to Jitsumu Kyouiku Kenkyujo rule above except for cursor and text on back of rule.  (All information from Wataru Tsuchihira.)


Baseball,  1966 -


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

125 x 28 mm.    Probably a promotional item from a professional baseball team but listed in Hemmi Catalog 6911 for a price of 120¥ (about $0.33 in 1969).  All four scales are 1-cycle logarithmic but the upper scale on the slide is folded at 0.9.   Came with a full sheet of instructions (in Japanese) plus abbreviated instructions on back of rule.  Instructions use example data from 1965 baseball season.  (Information and rule courtesy Wataru Tsuchihira.) 


Motoyama Valve Slide Rule


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

Air conditioning and refrigeration.



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.





Click on image to enlarge it.

  Versor Electronic Calculators, 1976

 
 
 

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.




MR80

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?


Calculates bending and shearing forces in machine presses.  Back is covered with tables and formulas.  Scales are 120 mm long; body is 46 mm wide and uses same CP-280 cursor as P280, P281 and P283 slide rules.  16-page instruction manual.  All Japanese language except name "Pressmate" on box and some labels like "(shear strength)" on rule.  No date code but a date in the late 1980s can be inferred since the scales are silk screen printed with thin transparent overlay like P135k (which was made in 2004) and the device was distributed by "MISUMI Shoji Co., Ltd." which used that name only from 1963 to 1989.   All information from Hitoshi Nori who also supplied the photograph.


 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.  The pictured specimen belongs to D. Boone.


 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]  DoK, LL3, LL2, LL1  Folded at p. Rear scales: Ch A~M, Ch N~Z, M1, Xw [X, M2, ToF, ToC, ToK]  Patm, PmmHg, Tow, 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]  DoK, LL3, LL2, LL1  Folded at p. Rear scales: Ch A~M, Ch N~Z, M1, Xw [X, M2, TI, SI, G]  Patm, PmmHg, ToF, ToC.

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 341-3050.


Pocket Versatrig, 1969 -71



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).


Mechanical Testing Laboratory, ca 1970

12.5-cm duplex--same body as Hemmi 149A except solid plastic.  Calculation of useful lifetime of bits used in metal turning lathes.  The name "Mechanical Testing Laboratory" is printed in Japanese characters on the back.  (The "Mechanical Testing Laboratory" is now known as "National Institute of Advanced Industrial Science and Technology.")

Picture courtesy D. Boone; the rule carries no date code.  Information courtesy Atsushi Tomozawa.


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



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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.


 

  All-Plastic Geotec 341-3690 Versalog II  (After 1975?)


Hughes-Owens/Geotec sold the Hemmi 258/Post 1460 Versalog as Geotec model 341-3010 Versalog.  The improved Versalog II was sold as Geotec model 341-3012.  I can find no record of Geotec model 341-3690 except the specimen shown here which was offered for sale on eBay 1/5/2015 by "baja_ron".  (Minimum bid $2999.99.  Did not sell.)  Rule is marked "Hemmi" but I'm guessing that Hemmi subcontracted manufacture of this rule after they got out of the slide rule business ca 1975.  Scales are almost identical to Post/Geotec Versalog II (except COS scale is black, not green) but the all-plastic body and cursor are unlike other Hemmi all-plastic rules.     
  

Specimen did not have a case. 


Slide Charts


Duct Slide Rule


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.


Weight Control Calculator  (Current production in 2015)


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Instructions (in Japanese) on back.  Picture and information courtesy Wataru Tsuchihira.


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