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 1925book 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?)
Same scales as bamboo rule above but all-plastic closed-body using
same cursor as Hemmi P280, P281, P283. No date
code. Photo courtesyWataru Tsuchihira. (Click
on picture to enlargeit.)
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 SlideRule" by JisukeMiyazaki.
Thereare 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
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 ofthe scales: "The scales are captioned
(from top to bottom) Year(G), Month(E), Month (F), Reverse(CI),
Day(C), Day(D). The gaugemarkson M scale are
various units of length and area, some Japanese and
some European.It appearsthat this rule is designed especially
for unit conversion." I can find no Hemmi documentation
of this rule.
Artillery Rule, 1942
Jihei Miyazaki [Development History
ofthe 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:0-20cm. 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 mmper unit) which means
the rule is for addition and subtraction--not multiplication
and division. Scale on upper stator is 200-0-200, 160mm 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
belowthe X scale. The e, N, and X scales are
three-cycle logarithmic: e runs from 10cm to100m, N and
X runfrom 1 to 1000. The N1/3 and N1/2
scales are the cube and square rootsof the N (and X) scale.
The N (X) scale gives the tangentofangles which are engraved
onthe right end of the N1/2 scaleand the
full length of the T scale. The range of angles
is6o to 89o57'. (Compare
tousualrange of6o to45o.)
The unlabeled scale on the bottomof the rule ismarked
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 to20km; 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 isa paraphrase ofTomozawa'a
explanation ofthose tables: One is definitely related
to distance (height) estimation using triangulation.
The secondtable consistsoftriangle formulas.
The third tablecontains three items: (1)Indirect method
oflevel estimation; (2) Levelmeasurement
bybarometer; (3) Earth parameters. The
fourthand fifth tables are related to map reading.
The sixth setof formulas is titled"Westward inclination
ofearthmagnetic field." Seventh: (1) Formulas
for photographic surveying; (2) Angleconversion 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 asHemmi 50W.) Calculating
scales onfour surfaces (front, back of slide, top
slanted edge,and bottom vertical edge).
Top, slantededge carries a non-linear scale labeled
"V" near left end and a 0 - 10 cmscale at right end.
Face of rule carries eightfull-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
endsof 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)areon the back of the slide.Special cursor
with flexible tabextending from top edge; cursor must be reversed
when usingscales onbottomedge of rule. It is possible that
some operations were tobe 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 whichseems to relateto this slide rule.
The following information
is from Atsushi Tomozawa:
The name "Byou-tou" comes from two Chinese
characters "byou" and "tou" ona box containing a
specimen of this rule in the Hemmi Offices in Tokyo.
Thefirst character translates to sprout, bud or shoot
ofa young plant; the second means "head." "Shooting
Heading"is not animpossible translation. "Development
History of the SlideRule" by Jihei Miyazaki states that
the Byoutou rulewas introduced in 1944 but does not
mention what function the rule served. Another book,
"Historyof the Slide Rule," written for the Royal Navy Military
Schools in 1944explains how to use the rule to calculate
a correctionangle for firing at moving ships; thecorrected
angleis 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.
6400 Ao/oo Topo (Swiss Army
Artillery Rule) 1952
This slide rule is mentioned
in conjunction withthewell-knownLOGA TOPO 6400 Ao/oo
circular stadia rule in a Swissarmy publication"Instruments
for Measuring and Observation in the Artillery"published 1952.
The label on the slide reads "6400 Ao/ooTopo"
which impliesthat the rule was intended for use in conjunction
with the Loga rule. Thepicturedspecimen
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; datecode is "RD."
Meteorological Slide Rule?
eBayauction
6248834536, Feb-05-06. Wonby "Waynesworld."
Here is theseller's description:
"A 10 inchbamboo baseSunHemmi rule, no
model number, andnot listed in the catalogs
available. The face scales are:Pressure in mmHg,
B, CI, Height(same as C scale) ABS Temp (-50 to +200C).
The reverse side scales are:Height in Km, Pot. Temp. Coef.
(mmHg.mb), and Temp. Fact. (-60to +40 C). Therule has
a 10 inch scale onthe lower edge and a 0-27cm scale on
the upper edge. Possibly used for barometric calculations
and othermeteorological purposes."
Carrier Ductuler (Bamboo), 1961.
Bamboo and celluloid.
Fordesign of airconditioning ducts.
Date code"LC"= March1961. Predecessortothe
all-plasticCarrier 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 bein error or I may
have misunderstood what was being described orHemmi
mayhave changed their minds before actuallyproducing them.
If they existed they wereprobably closed-body
rulesmade of bamboo and celluloid similar to the devices
listed above.
Astronavigation Rule, 1938
Jihei Miyazaki [Development History of the Slide
Rule, May1956] and Katsunori Kadokura [Chronology of Japanese
Slide Rules, Journalofthe 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, May1956] lists a "Ratio" rule as having been introduced
in 1939. Katsunori Kadokura [Chronology of Japanese Slide Rules,
Journal ofthe 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, May1956] and Katsunori Kadokura [Chronology of Japanese
Slide Rules, Journalofthe 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
ruleDevelopment,” gives the date
for this rule as1939. JiheiMiyazaki
[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, August1992.] both list
a "Communications Engineering" rule as being introduced
in 1943.It is not impossible that rule shown asHemmi
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, May1956] lists an "Altitude Correction" rule as having
been introduced in1943. 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 [Chronologyof
Japanese Slide Rules, Journal of the Oughtred
Society, vol. 1, no.2, August 1992.] both list
a "Transmission" ruleas being introducedin in1943.
Power Load Rule, 1955
Jihei Miyazaki [Development
History of the Slide Rule,May
1956] says a "Power Load Rule" was developed
in 1955 for KyushuElectric 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 turboprop. Plane was
manufactured from 1964 to 1974;rulepresumably dates
from that period. Picture copyright
by Bill Lise.
Real Estate, 1964
All-plastic ||closed
body|| in twosizes: 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 codesOJ, OK.
Instructions printed 1965.
Carrier Ductuler (All-Plastic), 1965
All-plastic ||closed
body|| 200 x 28 x 5 mm.
For design ofair conditioning ducts. Probably
predecessor toHemmimodel 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 byWartaru Tsuchihira.
Electrician's Rule, ca 1965
12.5-cm
all-plastic closed body.
Scales seem tobeoriented toward selection
ofwire gaugeand calculation of voltagedrop and
power loss. Rear of slidecarries three
scales. Possiblysame as Power Load Rule (1955)
described above.
Picture courtesy D. Boone; therulecarries
nodate 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 isdated "RH"(August 1967).
The later version is all-plastic. The
specimen shown here is dated "ZC" (March
1975).
Click
on picture to enlarge.
Scale length for both of these
rules is 180 mm.
There
arethree logarithmic scales which runfrom0.1
to 10,000 (five cycles).
Allinformation from Wataru
Tuschihira whoownsthe specimenspictured.
Hydraulic Flow Rule 1971
Another hydraulic
flowrulefromHemmi. This specimen is dated"VG"
(July1971).Front ofrule (upper picture) implements
theHazenand Williams formula; rear (lower picture) implements
the Manning System.The specimen pictured belongs
to Wataru Tsuchihira.
Dr Won's Hydraulic Slide Rule
Click on picture to enlarge it.
A similar slide rule was sold on eBay January 15,
2017 by "daboyryan" for $213.50. The
only information provided bythe seller was "This slide
was invented byProf. DrTae-Sang Won and is made for Pipe
Lines." I have notbeen able to getany 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
whokindlyprovided the picture. The previous owner
toldhimthat the shorterrule was a promotional give-away
from a company which designs wastewater system. The shorter rule
has manufacturing date code "WK" (November1972); the longer "XD"
(April 1973).
Body Weight Balance, 1972
200
x 28 mm (same blank as Hemmi P45D,
P45K, P45S). Listed ina 1972 Japanese
language flyer. Calculates "obesity" (similar
to body mass index, BMI?),"Raurel Index," and "Carp
Index" based onstudent's weight and height.
Brochure specifically usesthe 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.
Cardiothoracic Ratio Calculator, 2015?
||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 productin
2015. Picture supplied by Wataru Tsuchihira.Inset
detail shows one of the springs which hold the slide in
place.
Heart/Chest Rule 2018?
Transparent rule at top of picture is used to measure
heart andchestdimensions on x-ray. Instruction are in Japanese.
Photo and information from Cliff Frohlich.
Gas Calibration Rule
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.
"OVAL" Pneumatic
Flow(?) Rule
This rule was discovered by Joshua Kanazawa. It's
exact function is unknown but "OVAL" is a well-known manufacturer of pneumatic
devices. Date code "KC" = March 1960.
Devices made of Folded
Paper, Plastic Sheeting, etc.
Sawa's Exposure Reckoner A R S, 1936
Paper slide ruleforcalculating
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 andcase 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 isfrom anAugust 2014 auction on TradeMe
(New Zealand). Information is from
Bill Lise who examineda museum specimen dated 1943
onits back.
Jitsumu Kyouiku Kenkyujo
An all-paper Hemmi slide rule discovered
by Wataru Tsuchihira. Scales
are 150 mmlong. Back isblank except
for "JitsumuKyouiku Kenkyujo" in
Japanese characters. The
Hemmi logo in condensed black Arial type was
used by Hemmi inthe 1950sand 60s. Jitsumu Kyouiku
Kenkyujo isa foundation, still in business in2015,
offering various correspondence courses. Areasonable
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 rulediscoveredby
Wataru Tsuchihira. Distributed witha magazine for
first-year junior high school students inFebruary 1970.
Identical construction to Jitsumu
Kyouiku Kenkyujorule above except for cursor and
textonback of rule . (All information from Wataru Tsuchihira.)
Baseball, 1966 -
125
x 28 mm. Probably
a promotional item from a professional baseball
teambut listed inHemmi Catalog 6911 for a price of
120¥ (about $0.33 in 1969). Allfour scales
are 1-cycle logarithmic but the upper scaleonthe slide
is folded at0.9. Came with a fullsheetof instructions
(in Japanese) plus abbreviated instructions on back
of rule. Instructions use example data from 1965
baseball season.(Information andrulecourtesy Wataru
Tsuchihira.)
Motoyama Valve Slide Rule
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 whichwere
popular for technical presentation in the 1940s and
50s. Scales are identicalto Hemmi model 2662.
Three sheets are superimposed: (1) Scales on face
ofrule, (2) Scales on rear of slide,(3) cursor.
More modern projection slide rules for overhead projectors
use thesame three sheets.
Picture and all information
courtesy Hitoshi Nori.
Planisphere (1940s)
Based
on Kanji characters usedandhowdomestic Japan is
referred toin the instructions on back, WataruTsuchihira
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
In1976Hemmi teamed
withBrother Industries to produce a a lineof
electronic calculators. There were four
models:Versor 804,814, 824and 834. (The pictured
calculator is marked "Hemmi Versor 824.")
This information is from Hitoshi Nori who is not aware
ofany specimensin existence in 2009.
MR80 Electronic Calculator
This device is owned by Wataru
Tusuchihira whosaysit is working finein June 2017.
Manufactured by Brotheras model508AY.
PressMate, Late 1980s?
Calculates
bending and shearing forces in machine
presses. Back iscovered with tables
and formulas. Scales are120 mmlong;body is
46 mmwide and uses same CP-280 cursor as P280, P281
and P283 slide rules. 16-page instruction manual.
All Japaneselanguage except name "Pressmate" on box
andsome labels like "(shearstrength)"on rule.No date
codebuta date in the late 1980scan be inferred since thescales
are silkscreen printed with thin transparent overlay like
P135k (which was made in2004) and the device was distributed
by "MISUMIShoji Co., Ltd." which used thatname 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 Hemmifor the Frederick Post
Co. ofChicago (Post model number 1461) and
for the Hughes Owens Co. of Canada (Geotec 341 3050).
Samescalesasfull-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 [TT, SecT ST, Cos S, C] D, LL3, LL2,
LL1. 125 x 34 x 3.5 mm.
Onbothfull-size andpocket Versalogs,
the COSscale was in navy blue until1960
when the color changed to green. The earlier
rulesaregenerally identifiedas models IA, the
latter asmodels 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 ca1972 after which it became
Teledyne-Post 44CA-500. Soldin 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 [TT,SecT ST, Cos S, C] D, DI.
250 mm x 1-5/8x 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
ca1965-67.
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. Rearscales:
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
ofthis variant known tome. It carries
a datecode of "RA." See discussion of Metal-Chemistry
Rule II below foradditional 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
instructionmanual directly from Hemmi about 2004.
The Hemmi employees he dealt with identified it as a "Metal-Chemistry" rule. (D. Boone owns
the other specimen.) Basedupon its similarity to the Hemmi Chemistry rule (model 257L) it is possible that
this rule was intended to be marketed as mode l277 but no such model number appears in anyknown 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, LL0and 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 bytheHughes 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.
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 3413125).
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 3.5mm.
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 ofhas
datecode "TE" (May 1969).
Geotec 341-3670 All-Plastic Pocket Versalog II (c 1975)
Geotec 341-3670. All-plastic version of
Pocket Versalog II probably made by Uchida Yoko Company
expressely for Geotec. Definitely not made
by Hemmi. The question is "Why does it carry the 'Hemmi'
name if it was made by Uchida for Geotec?" Standard Versalog
II scales: LL/o, K, A, DF [CF,
CIF, CI, C]
D, R1, R2, LLo and L, LL/1,LL/2, LL/3 [T
T, SecTSRT, Cos S, C] D, LL3, LL2,
LL1. Picture courtesy Ron Knapp.
Geotec 341-3690 All-Plastic Full-Size Versalog
II (c 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" (Ron
Knapp) with a minimum bid of $2999.99. Ron offered it again
on 11/17/2018 and it sold for $435. The picture here is copied
from that listing.
Rule is marked "VERSALOG 341-3690" and "HEMMI
JAPAN" but I believe it was made by Uchida after Hemmi got
out ofthe slide rule business ca1975. Scales are
identical to Post/Geotec Versalog II(except COS scale is
black, not green) but the all-plastic body and cursor
appear identicalto Uchida rules of the same size.
Specimen did not have a case.
Machine Tool Endurance Estimation Rule, 1967-68 (Homma Metal Works)
12.5-cm duplex--same body as Hemmi 149A
except solid plastic. Calculation
of useful lifetime of bits used in metal turning lathes.
Thisspecimencarries 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 ofAdvanced
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 "HOMMAMETALWORKS 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
asthe 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" (January1974).It belongs to Wataru
Tsuchihira.
Denkishoin Electrical Slide Rule, ca 1976
Plastic duplex. 250 x 46 x 5 mm, same
blank asHemmi P261, P262.
Rear scales are T q2, T q1, S q, R 1 [R 2, B, CI, C]
D, SR, TR 1, TR 2.
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"
(Ron Knapp) with a minimum bid of $2999.99. Ron offered it
again on 11/17/2018 with a minimum bid of $399.99. The picture
here copied from that listing.
Rule is marked "VERSALOG 341-3690" and "HEMMI
JAPAN" but I believe it was made by Uchida after Hemmi got
out of the slide rule business ca1975. Scales are
identical to Post/Geotec Versalog II(except COS scale is
black, not green) but the all-plastic body and cursor
appear identical to Uchida rules of the same size.
Specimen did not have a case.
Slide Charts
Homma Metal Machining Slide Chart (1976)
Slide chart for determing time required
for metal planing turning and drilling. Twelve-page
manual in Japanese and English. Manual is dated 1976.
Construction is typical of Hemmi slide charts
but probably not in current (2018) production.
(Hemmi website does not mention metal machining among subjects
for which Hemmi has slide charts available.) Photos and Instruction Manual from Cliff Frohlich.
Homma also distributed a Hemmi-made duplex slide
rule designed by the Mechanical Testing Laboratory. See
the section on Duplex Slide Rules above.
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.
Weight Control Calculator (Current production in 2015)
Instructions (in Japanese) on back. Picture
and information courtesy Wataru Tsuchihira.
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