HOME


Nordic Slide Rules
from Denmark and Sweden
(Manufacturers not found in their own gallery)


KEEP ISRM FREE!

Letter to Marvin Clarence from the Queen of Denmark in support of ISRM
This gallery is dedicated to Danish and Swedish slide rules and manufacturers of that region.
It is unknown if Finland ever made or rebranded a slide rule for their market.
Manufacturers/Brands Represented: CARID - Denmark, DIWA - Denmark, Norden - Sweden, Teknor - Sweden, UTO - Denmark, J.H. Weil - Denmark, X-Act - Denmark.

Denmark



CARID #3000 Log Log Decitrig Duplex

REF
CARID #3000 Log Log Decitrig Duplex
Made in Denmark - Identical to DIWA No.911
Construction note: Celluloid laminated wood stock. Cursor design and lens retention is similar to early Dietzgen duplexes
Front Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Back Scale: LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K
Archive - Steve Seale Collection, Nashville, Tennessee.


DIWA - Dansk Industri for Waterpasser A/S (Danish Industry for Levels Ltd.). Was a Danish manufacturer of slide rules in gentofte, Denmark. DIWA originally began in 1854, starting as a small general store, supplying farmers in the region with a variety of items such as paint, cigars, wine, photographic equipment, tapestry, etc. In 1873 Ove Nielsen purchased the store and enlarged the business selling fuel. The third generation of Nielsens developed the area with housing, many shops, factories and a cinema. In 1924 they began making of slide rules and measuring devices in a small shop to the Danish market and to other Scandinavian countries. By 1940 they moved totally out of retailing to becoming full-time manufacturers of spirit-levels and slide rules eventually becoming Europe's leading firm in spirit-level manufacturing supplying more than half of all spirit-levels used in England. Because of war shortages, slide rule manufacture became increasingly important to their business with a 16 year partnership with Kruuse and Larsen, DIWA had experience in the complicated wood work and Kruuse/Larsen had their knowledge on scale dividing which was the basis for their collaboration.Kruuse and Larsen later went their own way and founded the company UTO. After WWII, 16 models were produced, and exported. Some sold through a Lawes Rabjohns Catalog. Students at the university and teachers' colleges in Denmark were required to use the Rietz-Ideal slide rule. Supplier to India brand Deeva. In the late 1980's the DIWA slide rules were sold by LINEX. All slide rule manufacturing stopped in the 1990's. DIWA no longer exists as a company.


Diwa No. 14

ISRM 14.01.10.29

Diwa No. 14
Made in Denmark - Metal and plastic. (Note cursor similar to early Dietzgen)
Front Scale: LL01, K, B [ A, T Cot, ST, S Cos, S ] D, L, LL1
Back Scale: LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


Diwa Log Log 101

ISRM 13.10.09.01


wood clamshell case
Diwa Log Log 101 - c1948
Made in Denmark - Wood w/Plastic laminate
Note 1: 'Railroad Track' style divisions engraved on 'DIWANYL' plastic facings.
Note 2: Beautiful wood clamshell box with use care instructions on both sides.
Front Scale: 10in // LL2, A [ B, CI, C ] D, LL3 || K
Back Scale (window)
[ S, S&T, T ]
Back: Equivalents
Cursor: 3 hairlines, extended to side (for K scale)
Gift of Phillip Rodley of UpperHutt, New Zealand
This slide rule and others in the ISRM archives and galleries were donated through the generosity and support of Phillip Rodley. Phil is very enthusiatic in finding slide rules in New Zealand that are not available to the rest of the world, and gifting them to ISRM. He enjoys the American brands that have leather sleeves and belt loops.


Diwa No.111 Electro

ISRM 14.01.03.08


Leather sleeve

Also stamped inside flap of sleeve is 'LEES (W) LTD 1943'. Lees (W) ltd. is a company located in Walsall, UK, which made wholesale leather products for firms like Diwa. It is still in business..
Diwa No.111 Electro - 1943-1950
Made in Denmark - Wood w/Plastic laminate screwed to stock.
Front Scale: 10-1/4inch // LL2, A (Kw) [ B (mm2)(H.P.), C (Watt) ] D, LL03 || K
Well: Motor TL=%, Volt
Back Scale (window)
[ S, S&T, T ]
Back: Equivalents (English)
Cursor: 3 hairlines on top, one on bottom edge
Original Owner: M.P. Armstrong. Etched on bottom of stock, written in manual and inside flap of sleeve.
Gift Of Phillip Rodley of UpperHutt, New Zealand
 
Instructions (4.29MB PDF)
M.P. Armstrong, most likely an electrical engineer, worked at Reyrolle in 1950 and later, A. Reyrolle & Co. had a New Zealand division, called Reyrolle Pacific.
A. Reyrolle & Co. was a British engineering firm based in Hebburn, Tyne and Wear in the North East of England. The company was founded by Alphonse Constant Reyrolle, a Frenchman, in 1886 at Fitzroy Square in London to produce scientific instruments. He moved the business to Hebburn on Tyneside in 1901. For many years the company was one of the largest employers on Tyneside. The New Zealand division, Reyrolle Pacific, was sold by Siemens AG/VA Tech to a private individual in New Zealand. This included the switchgear factory in Petone, with a staff of about 100. Reyrolle Pacific Switchgear became RPS Switchgear and manufactures retrofit breakers for the original LMT switchgear, and vacuum breakers and panels for 11 kV substations.


Diwa No.111 Electro

ISRM 21.08.12.10

Diwa No.111 Electro - 1971
Made in Denmark - Wood w/Plastic laminate screwed to stock.
Front Scale: 27cm // LL2, A (10Amp)(Kw) [ B (10m, 10mm2)(H.P.), CI, C (Watt) ] D, LL3 || K
Well: Motor, Volt
Back Scale (window)
[ S, S&T, T ]
Back: Equivalents (English)
Cursor: 3 hairlines on top, one on bottom edge
Original Owner: D.C. Meyer. written on inside flap of sleeve.

Leather sleeve


Diwa 201 Technical

REF
Diwa 201 Technical - c1955
Made in Denmark - Wood w/Plastic laminate
Front Scale: 25cm // K, A [ B, CI, C ] D, L
Back Scale (window)
[ S, S&T, T ]
Back: Equivalents
Cursor: 3 hairlines
Archive Herman van Herwijnen's SR Catalogue


Diwa No.301 Commercial

ISRM 13.07.03.23
Diwa No.301 Commercial
Made in Denmark - Wood with Plastic laminate, rivet and screw reinforcement
Note: Railroad track style divisions
Front Scale: A [ B, CI, C ] D
Back Scale:[ S, S&T, T ]
Back: Equivalents
Cursor: 3 hairlines
Gift of Daniel Swerdlow, Bethesda, Maryland.


Diwa No.301 Log Log

ISRM 19.09.30.01
Diwa No.301 Log Log - date code 75 (July 1955)
Made in Copenhagen, Denmark - made of DIVINYL Plastic laminated wood.
Note: Railroad track style divisions
Front Scale: 25cm, 10in // L, K, A [ B, CI, C ] D, LL3, LL2, LL1
Back Scale: [ S, S&T, T ]
Back: Equivalents (English)
Cursor: 3 hairlines
Original owner: Alan E. Perry (imprinted on stock and written on sleeve flap). Research(?): Alan E. Perry (1938-2013), born in New London, CT, graduated from New London High School and UCONN and enlisted in the US Air Force.. He married Madeline (Kutschirek) who predeceased him in 2003. Alan went to work for Boeing in Washington State. He later worked at United Nuclear in Montville, CT until his retirement.
Gift Of Sarah Coury of Sarasota, Florida
 
English Instructions (10.3MB PDF), Leather sleeve


Diwa No.301 Rietz

ISRM 14.01.03.02
Diwa No.301 Rietz - date code 36 (March 1956)
Made in Copenhagen, Denmark - made of DIVINYL Plastic laminated wood.
Note: Railroad track style divisions
Front Scale: 25cm, 10in // A [ B, CI, C ] D
Back Scale: [ S, S&T, T ]
Back: Equivalents (English)
Cursor: 3 hairlines
Gift Of Phillip Rodley of Upperhutt, New Zealand
   
English Instructions (10.3MB PDF), Box end,
Use and Care Insert (in Danish/English/German/French/Spanish)


Diwa No.301 Rietz (German version)

ISRM 11.11.18.01
Diwa No.301 Rietz - Date Code 37 (March 1957)
Made in Copenhagen, Denmark - made of DIVINYL Plastic laminated wood.
Front Scale: 25cm, 10in // K, A [ B, CI, C ] D, L
Back Scale (window)
[ S, S&T, T ]
Back: Equivalents (German)
Cursor: 3 hairlines


Diwa 311 Electro

REF S315
Diwa 311 Electro - Closed simplex
Made in Copenhagen, Denmark - made of DIVINYL Plastic laminated wood.
Front Scale: 25cm, 10in // Dynamo/Motor, K, A(kW) [ B(hp), CI, C ] D, Volt, tg ctg, cin cos
Back Scale (window)
[LL1, LL2, LL3 ]
Back: Equivalents
Cursor: 4 hairlines


Diwa Rietz-Ideal No. 1-1

ISRM 17.05.02.59
Diwa Rietz-Ideal No. 1-1
Made in Denmark - All Plastic
Front Scale: 25cm/10in // L, K, A [ B, CI, C ] D, S, ST, T
Back Scale: Blank
Cursor: 3 hairlines
Original Owner: Albolm Skole
Gift Of Mike Weaver, UK


Diwa No. 501 Rietz

REF

Diwa No. 501 Rietz
Made in Denmark - All Plastic
Front Scale: 27cm // K, A [ B, CI, C ] D, L
Back Scale: S, S&T, T
Cursor: 3 hairlines
Original Owner: Ir. Albert Kartahardja (1928-2017) of Bandung, Indonesia.
Scan provided by Marvin Clarence, the grandson of Albert Kartahardja
Ir. Albert Kartahardja was born on 18 June 1928 in Batavia. He was a Civil Engineering Engineer who studied at the Faculteit van Technische Wetenschap, Universiteit van Indonesie te Bandoeng (Faculty of Engineering Sciences, University of Indonesia in Bandoeng), class of 1947. On 1 November 1960, he founded the Faculty of Engineering at Universitas Katolik Parahyangan (Parahyangan Catholic University) alongside Prof. Ir. A.M. Semawi, Ir. Tjan Kwie Nio and Ir. Dr. M.A. Sosrowinarso. Ir. Albert Kartahardja served as Director of the Institute for Research on Problems in Building Construction - Department of Public Works, under the then Minister Prof. Dr. Soetami and Dr. Purnomosidi Hardjisarosa. Apart from his main occupation, he also served as a Lecturer at Unpar (Parahyangan Catholic University), and as Assistant Dean for Civil Engineering, Academic Affairs (1979-1983). He has written many books and articles on settlements and building issues and was one of the leading technology experts in Indonesia. He died on 1 April 2017 in Bandung.


601/631 Instruction Sheet
Diwa 601 Rietz
ISRM 22.03.01.103
Diwa 601 Rietz
Made in Denmark - Metal cursor blocks, Plastic lens.
Front Scale: 5in // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 hairlines
Back Advertising: PSC Applied Research Limited, Toronto, Canada
Gift Of Philip E. Stanley


Diwa 601-1 Rietz V1 Promo: Components Inc., Arizona Div.

ISRM 12.06.24.35
Diwa 601-1 V1 Rietz Promotional - dc294
Made in Denmark - All Plastic - Note 25mm wide Cursor, double bend spring.
Front Scale: 5.5in // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 hairlines
Back Advertising: Components Inc., Arizona Div.
Donated by the Anonymous Collector and daughter.


Diwa 601-1 Rietz V2 Promo: Fansteel
ISRM 15.07.20.07
Diwa 601-1 V1 Rietz Promotional - no Date Code
Made in Denmark - All Plastic - Note: 22mm narrow cursor, single bend spring.
Front Scale: 5.5in // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 hairlines
Back Advertising: Fansteel, North Chicago, Illinois.
Belonged to: R.W. Kratz
Donated by son, Nick Kratz, Pasadena, California


Diwa 601 Rietz - Lear Jet promo c1963
ISRM 20.04.01.054
Diwa 601 Rietz - Lear Jet promo c1963
Made in Denmark - No "Diwa" on stock.All 23mm Plastic cursor. spring captured outside of lens.
Front Scale: 5in // K, A [ B, CI, C ] D, L
Back Scale: 13cm [ S, S&T, T ]
Cursor: multiple hairlines
Back Advertising:Lear Jet
Gift of Philip E. Stanley, Worcester, Mass.



Diwa 601-1 Rietz V1 Promo: ITT Cannon Electric
ISRM 14.10.15.06
Diwa 601-1 V1 Rietz Promotional - dc276
Made in Denmark - All Plastic - Note: wide 25mm cursor double bend spring.
Front Scale: 5.5in // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 hairlines
Back Advertising: ITT Cannon Electric
Gift of Edward Wright, Odenton, Maryland.


Diwa 601-1 Rietz V2 Promo: Grundfoss Bjerringbro Pumpefabrik

ISRM 12.06.24.36
Diwa 601-1 Rietz V2 Promotional - dc012
Made in Denmark - All Plastic
Front Scale: 11cm, 4.5inch // K, A [ B, CI, C ] D, L
Back Scale: [ S, ST, T ]
Cursor: 3 hairlines
Back Advertising: Grundfoss Bjerringbro Pumpefabrik A/S (Pump Fabricators)
Donated by the Huang Collection and daughter.


Diwa 601-1 Rietz V2 Promo: Engineers Scientists Guild at Lockheed

ISRM 14.07.02.98
Diwa 601-1 Rietz V2 Promo: Engineers Scientists Guild at Lockheed
Made in Denmark - All Plastic
Front Scale[extended]
11cm, 4.5inch // K, A [ B, CI, C ] D, L
Back Scale: [ S, ST, T ]
Cursor: 3 hairlines
Back Advertising: Engineers Scientists Guild, Lockheed Section
Gift of Ed Millis, Dallas, Texas.


Diwa 611 Electro Pocket

ISRM 12.03.02.16
Diwa 611 Electro Pocket
Made in Denmark - All Plastic
Front Scale: 13cm // Cos1, A(Kw) [ B(HP), CI, C ] D, Cos2
Back Scale: [ S, S&T, T ]
Well scale: Dyn-Mot, V
Cursor: 3 hairlines
Back Advertising: POHJOISMAINEN SÄHKÖ-OSAKEYHTIÖ
Donated by Richard Davis, Las Vegas, Nevada


Diwa 621 Technical 13cm Pocket Slide Rule

ISRM 20.04.01.281
Diwa 621 Technical 13cm Pocket Slide Rule
Made in Denmark - All Plastic. Instructions in English and German.
Front Scale: 13cm // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 hairlines
Back: Diwa manufacturing Logo
Gift of Philip E. Stanley, Worcester, Mass.


Diwa 631 Commercial 11cm Pocket Slide Rule

ISRM 20.04.01.281
Diwa 631 Commercial 11cm Pocket Slide Rule
Note: Standard Rietz Scales like a 601, but instructions sgive it a "Commercial;" model suffix.
Made in Denmark - Metal Edge cursor Instructions in English and German..
Front Scale: 11cm, 4-1/2inch // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 hairlines
Back: Hume Pipes
Gift of Philip E. Stanley, Worcester, Mass.


Diwa 641 Business Slide Rule

ISRM 20.04.01.427
Diwa 641 Business Slide Rule
Made in Denmark - All Plastic
Front Scale: 13cm // KZ [ T, Val(P%), E, T] V(Z)
Back Scale: Blank
Cursor: single hairlines
Back: Hume Pipes
Gift of Philip E. Stanley, Worcester, Mass.


Diwa Ideal No. 701 Export

ISRM 13.09.24.01
Diwa Ideal No. 701 Export
Made in Denmark - All Plastic, with blue highlight on stock.
Front Scale: L, K, A [ B, CI, C ] D, S Cos, ST Arc, T Cot
Back Scale: 25cm, DF [ CF, C ] D, 0-8 inch, 8-0 inch
Cursor: 4 hairlines
Donated by Mikael Seierup, Denmark. Belonged to his father.




Diwa 710 Teknilog

REF
Diwa 710 Teknilog - Duplex
Made in Denmark
Front Scale: LL00, ST, T, DF [ CF, CIF, CI, C ] D, P, S, LL0
Back Scale: LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Cursor: 5 hairlines
Archive - Marion Moon Collection


Diwa 720 Polylog

ISRM 12.06.24.19
Diwa 720 Polylog - date code 320
Made in Denmark
Front Scale: LL00, L, K, A [ B, S, ST, T, C ] D, DI, P, LL0
Back Scale: LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Cursor: 5 hairlines
Donated by the Huang Collection and daughter.
The collector, who prefers to remain anonymous, obtained a B.S. degree in Physics from Taiwan's National Tsing Hua University in 1971. His love for computation has encouraged him to build a collection of slide rules, HP and TI calculators, as well as abaci, many displayed at ISRM.


Diwa No. 730 Combilog

REF
Diwa No. 730 Combilog
Made in Denmark
Front Scale: T1, T2, A [ B, BI, CI, C ] D, P, S, ST
Back Scale: LL1, LL2, LL3, DF [ CF, CIF, CI, C ] D, L, K
Cursor: 5 hairlines
Archive - photos from Elena Diana Perucca, Argentina.


Diwa No.741 Businessman Export

ISRM 20.10.21.01

Diwa No.741 Businessman Export
Made in Denmark
Front Scale: A, DF [ CF, B, %, CI, C ] D, K, L
Back Scale: 25cm [ blank ] 0-8in, 8-0in
Cursor: 4 hairlines
Gift Of Judith Harris of Bording, Denmark.


DIWA Darmstadt No. 851/4 Pocket Duplex

ISRM 12.11.20.02
DIWA Darmstadt No. 851/4 Pocket Duplex
Made in Denmark by DIWA
Front Scale: K, A [ B, CI, C ] D, P \\ 11cm 4in
Back Scale: L, S Cos [ LL1, LL2, LL3 ] D. T Cot
Mulitiple hair-lined cursor
Donated by Ron Dies,Vancouver, British Columbia, Canada
Ron Dies purchased and used this slide rule (see also his Hughes-Owens 1771 slide rule in the Hemmi gallery) when he was studying architecture from 1956-1962 at the University of Manitoba in Winnipeg. He used these slide rules until electronic slide rules became more useful in his career. He is currently owner of Ron Dies Architecture in Vancouver and is near retirement.


Diwa No.901 Log Log Duplex Decitrig

ISRM 20.08.07.01
Diwa No.901 Log Log Duplex Decitrig
Made in Denmark (closely resembles early Dietzgen patents and construction)
Material: Laminated wood with metal braces. Flat glass lens clamped in place.
Front Scale: LL0, LL00, A [ B, T Cot, ST, S Cos, C ] D, DI, K
Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original owner: Marked M.J.Williams, CH (ChristsChurch) on flap
Donated by Phillip Rodley, Upperhutt, NZ


Diwa No.911 Log Log Deci-Trig Duplex

ISRM 09.01.12.93
Diwa No.911 Log Log Deci-Trig Duplex - Version 1
Made in Denmark (closely resembles early Dietzgen patents and construction)
Material: Laminated wood with metal braces.
Front Scale: LL0, LL00, A [ B, T Cot, ST, S Cos, C ] D, DI, K
Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, Virginia
David's first SR was a circular Pickett 101-C, which he acquired in high school. His interest led his parents to give him a K&E 68-1210 as a graduation gift. After college, David worked fifteen years for the U.S. Navy as a contracting officer and is now retired from Civil Service. His slide rule collection specializes in Picketts and he enjoys traveling to board game conventions. Member of the Oughtred Society. Donor of numerous slide rules to ISRM and its SR Loaner Program.


Diwa No.911 Log Log Deci-Trig Duplex

ISRM 21.08.12.11
Diwa No.911 Log Log Deci-Trig Duplex - Version 2
Made in Denmark (closely resembles early Dietzgen patents and construction)
Note: Diwa Logo moved to end of slide.
Material: Laminated wood with metal braces.
Front Scale: LL0, LL00, A [ B, T Cot, ST, S Cos, C ] D, DI, K
Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


Diwa No.913 Log Log Deci-Trig Duplex

ISRM 21.08.12.12
Diwa No.913 Log Log Deci-Trig Duplex
Made in Denmark - Same scale set as No.914
Material: Laminated wood with metal braces.
Front Scale: LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1
Back Scale: LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


Diwa No.914 Log Log Deci-Trig Duplex

ISRM 21.08.07.12
Diwa No.914 Log Log Deci-Trig Duplex
Made in Denmark - Same scale set as No.913
Material: Laminated wood with metal braces.
Front Scale: LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1
Back Scale: LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Gifted by William Lisowski of Pennsylvania.
Original Owner: T.P. Markle (written onn sleeve)

Norden



Norden Pocket

ISRM 20.04.01.402
Norden Pocket
Made in Sweden, It appears to use a Bruning 2401 stock
Front Scale
14cm // K, A [ B, CI, C ] D, L \\ sin cos
Back  Adv: SKF
Back Scale: [ Log, tg ctg, P ]
Gift Of Philip Stanley Collection

TEKNOR

Not much is known about this brand of slide rule, and whether or not it was distributed out of the USA, UK or Europe. The specimen shown in this gallery was obviously made in Japan by Uchido Yoko, Co (was Hemmi) which mas an OEM for re-branded slide rule catalog distributors. Other re-branded models with the Teknor label were made by UTO in Denmark such as the UTO 930U Poly-e. An ebay search reveals these other models:
TEKNOR NO.1055 Grundskola (Elementary School in Swedish) Slide Rule
TEKNOR No.1061 Högstadium (High School in Swedish) Slide Rule
So the distributor is determined to have been in Sweden.


Need TEKNOR No.1055 Grundskola Slide Rule or image


TEKNOR No.1061 Högstadium Slide Rule

REF: Need specimen
Need TEKNOR No.1061 Högstadium Slide Rule
Made in Japan for Swedish Distributor TEKNOR (by Uchida Yoko, Co)
Note: Unusual scale arrangement with two Sin/Cos scales.
Front Scale: 25cm, DF [ S Cos, CI, C ] D, A, K
Back Scale: T1, T2 [ CF, CIF, CI, C ] D, P, S Cos
Cursor: Multiple Hairlines
Archive photo


TEKNOR No.1081 Gymnasium

ISRM 12.03.02.08
TEKNOR No.1081 Gymnasium
Made in Japan for Swedish Distributor TEKNOR (by Uchida Yoko, Co)
Note: Exactly the same as Technical Sales 1081 TechLog Emblem Series
Front Scale: LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale: T2, T1, ST, DF [ CF, CIF, CI, C ] D, P, S Cos
Cursor: Multiple Hairlines
Donated by Richard Davis, Las Vegas, Nevada

UTO, Including HOFFMAN branded models

UTO - Fabrikken UTO out of Vonge, Denmark founded by Kal Kruuse and Poel Larsen after breaking away from DIWA, in 1957, a 16 year partnership. Kruuse and larsen had invented a logarithmic dividing (engraving) machine which had prompted DIWA to hire them in 1941. The UTO chracters do not stand for anything, but were chosen because this name could be pronounced very easily in America as well as in Japan. Hoffman, presumed to be a German distributor, appears on many of the model UTO 601 pocket slide rules. UTO slide rules are still made to this day. "The UTO SR's made now are silk screen printed on hard white PVC sheets, 7 - 9 bodies on a sheet, and machined to final shape. The cursors are injection molded of acrylic. The grooves for sliding the cursor are positioned to prevent the cursor to touch the SR surface. The printing ink bonds chemically to the PVC surface." Courtesy of John Kvint, of UTO. UTO board of Directors Poel Larsen, Kal Kruuse,and Hans Jorgenson can be seen in this Danish newspaper article and the ladies in the UTO Factory Floor. courtesy of IJ Schuitema.
For additional models made by UTO see Herman's Slide Rule Catalogue , UTO Sub-list


UTO No. 1 Studium

ISRM 09.01.12.125
UTO No. 1 Studium
Made in Denmark
Front Scale: A, DF [ CF, CIF, CI, C ] D, K
Back: Blank
Donated by David Hecht, Alexandria, VA


UTO 503 Studium

ISRM 09.01.12.126
UTO 503 Studium
Made in Denmark
Front Scale: 27cm // L, K, A [ B, CI, C ] D, ST, T, S
Back: Blank
Donated by David Hecht, Alexandria, VA


UTO 561 Studium

ISRM 09.01.12.127
UTO 561 Studium
Made in Denmark
Front Scale: 27cm // L, A, DF [ CF, CI, C ] D, ST ST, T Cot, S Cos
Back: Blank
Cursor: 3 Hairlines
Donated by David Hecht, Alexandria, VA


UTO 601 Rietz - Hoffman - Metal Cursor V1

ISRM 22.03.01.100
UTO 601 - Hoffman - Metal Cursor blocks V1
Note" Flat plastic lens and metal blocks.
Made in Denmark, Distributed by Hoffman, USA
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Slide: [ S, S&T, T ]
Back Adv: Industrial And Engineering Chemistry
Gift of Philip E. stanley of Worcester, Mass.


UTO 601 Rietz (Yellow Slide) Convex Lens V2-cm
ISRM 22.06.01.04
UTO 601 Rietz (Yellow Slide) Convex Lens V2-cm
Note: Molded convex lens. Variations 2
Made in Denmark
Front Scale: 13cm // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Back Adv: NORTH
Gift Of Ron Gribnitz.of South Africa. Belonged to father.


UTO 601 Rietz (Yellow Slide) Convex Lens V2-in
ISRM 14.10.15.05
UTO 601 Rietz (Yellow Slide) Convex Lens V2-in
Note: Molded convex lens. Variations 2
Made in Denmark
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Back Adv: NORTH
Gift of Edward Wright, Odenton, Maryland.


UTO 601 Rietz - Hoffman - CELCO Promo
ISRM 21.06.10.41
UTO 601 Rietz - Hoffman - CELCO Promo
Made in Denmark, Distributed by Hoffman, USA
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Back and sleeve Adv: Constantine Engineering Laboratories Co.
Gift of Bob Dehn collection.



UTO 601 Rietz Hoffman V2 Cursor

ISRM 14.01.10.05
UTO 601 Rietz Hoffman V2 Cursor
Made in Denmark
Front Scale:> 5inch // K, A [ B, CI, C ] D, L
Back Scale:
[ S, S&T, T ]
Back Adv: Raymond Concrete Pile Division
Gift of Bill Wehrend Collection, Palo Alto, California.


UTO 601 Rietz - Hoffman - General Electric Promo
ISRM 13.00.00.51
UTO 601 Rietz - Hoffman - General Electric Promo
Made in Denmark, Distributed by Hoffman, USA
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Slide: [ S, S&T, T ]
Back Adv: General Electric Power Tubes (GE).


UTO 601 Rietz - Hoffman - Valerian Promo
ISRM 21.08.07.41
UTO 601 Rietz - Hoffman - Valerian Promo
Made in Denmark, Distributed by Hoffman, USA
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Slide: [ S, S&T, T ]
Back Adv: Valerian - Palo Alto Tube Division
Gift Of William Lisowski of Pennsylvania


UTO 602 Basic - Hoffman

ISRM 20.04.01.142
UTO 602 Basic - Hoffman
Made in Denmark, Distributed by Hoffman, USA
Front Scale: K, A [ B, CI, C ] D, L
Back Scale: Blank
Back: Blank
Gift of Philip Stanley, Worcster, Massachusetts


UTO 604 - Piece 1 of 2 of a set

ISRM 22.03.01.98
UTO 604
Made in Denmark
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Slide: [ S, S&T, T ]
Note: Presumed to be a sales kit for marketing purposes.
Gift of Philip Stanley, Worcster, Massachusetts


UTO 605 - Piece 2 of 2 of a set

ISRM 22.03.01.99
UTO 605
Made in Denmark
Front Scale: 5inch // K, A [ B, CI, C ] D, L
Back Scale: Blank
Note: Presumed to be a sales kit for marketing purposes.
Gift of Philip Stanley, Worcster, Massachusetts


UTO 631U Hoffman Log Log Duplex

ISRM 20.04.01.214
UTO 631U Hoffman Log Log Duplex
Made in Denmark
Front Scale: L, K, A [ B, T Cot, ST, S Cos ] D, DI, P, S
Back Scale: LL01, LL02, LL03, DF(CR) [ CF(T), CIF, CI(%), C(T) ] D(R), LL3, LL2, LL1
Gift of Philip E. Stanley collection, Worcster, Massachusetts


UTO 651U Hoffman Duplolog

ISRM 20.04.01.173
UTO 651U Hoffman Duplolog
Made in Denmark
Front Scale: 5inch // L, K, A [ B, CI, C ] D, P, SCos, T Cot
Back Scale: [ LL01, LL02, LL03 ]
Gift of Philip E. Stanley, Worcster, Massachusetts


UTO 651U Darmstadt

ISRM 20.04.01.217
UTO 651U Darmstadt
Made in Denmark
Front Scale: 5inch // L, K, A [ B, CI, C ] D, P, SCos, T Cot
Back Scale: [ LL01, LL02, LL03 ]
Back Advertisement: Thomas Mercer Ltd, St. Albans, England
Gift of Philip E. Stanley collection, Worcster, Massachusetts


UTO 651U Darmstadt Hellerman

ISRM 17.05.02.24
UTO 651U Darmstadt Hellerman
Made in Denmark
Front Scale: 5inch // L, K, A [ B, CI, C ] D, P, SCos, T Cot
Back Scale: [ LL01, LL02, LL03 ]
Gift of Mike Weaver, Bridgend, United Kingdom


UTO 661 Commerce

ISRM 20.04.01.291
UTO 661 Commerce
Made in Denmark
Front Scale: 13cm // K, CR(DF) [ T(CF), %(CI), T(C)] R(D), A
Back Scale: [ S, S&T, T ]
Cursor: three hairlines
Back: Blank
Gift of Philip E. Stanley collection, Worcster, Massachusetts


UTO 930U Poly-e

S541
UTO 930U Poly-e
Made in Denmark
Front Scale: L, K, A [ B, T Cot, ST, S Cos ] D, DI, P
Back Scale: LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, Ll2, LL1
Original Owner: Robert Millar/Canada


UTO 930 Studium - Charvoz

REF
UTO 930 Studium
Made in Denmark
Front Scale: LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale: ST, T, T2 DF [ CF, CIF, CI, C ] D, DI, P, S
Archive - Rod Lovett collection


UTO 930 Studium

ISRM 09.01.12.110
UTO 930 Studium
Made in Denmark
Front Scale: LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale: ST, T, T2 DF [ CF, CIF, CI, C ] D, DI, P, S
Cursor: 3 Hairlines
Note: Very poor red ink, be careful in cleaning this model
Donated by David Hecht, Alexandria, VA


UTO Nr3-931U Poly-e Studium

ISRM 09.01.12.124
UTO Nr3-931U Poly-e Studium
Made in Denmark
Front Scale: LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale: ST, T, T2 DF [ CF, CIF, CI, C ] D, DI, P, S
Cursor: 3 Hairlines
Note: Very poor red ink, be careful in cleaning this model
Donated by David Hecht, Alexandria, VA


UTO 932 - Charvoz

REF
UTO 932 - Charvoz
Made in Denmark for Charvoz
Front Scale: LL00, K, A [ B, T Cot, ST, S Cos, C ] D, DI, LL0
Back Scale: LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D LL3, Ll2, LL1
Archive - Rod Lovett collection


UTO F2145

ISRM 09.01.12.123
UTO F2145
Made in Denmark
Front Scale: 11cm 4in // K, A [ B, CI, C ] D, L
Back Scale: [ S, S&T, T ]
Cursor: 3 Hairlines
Original Owner: C.W. Wright, Paris, Kentucky, USA
Note: Very poor red ink, be careful in cleaning this model
Donated by David Hecht, Alexandria, VA

J.H. Weil & Co.



J.H. Weil & Co. Polylog 1140 Duplex

REF
J.H. Weil & Co. Polylog 1140 Duplex
Made in Denmark
Front Scale: LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale: L, K, A [ B, T Cot, ST, S Cos ] D, DI, P
Archive - Steve Seale Collection

X-Act, Denmark.



X-Act No.222P 11cm/inch

ISRM 22.03.01.101
X-Act No.222P 11cm/4-in
Made by Denmark - Similar to UTO models, but cursor not interchangeable.
Front Scale: 1/2-inch, 0-11cm, 0-4in // K, A[ B, CI, C ] D, L
Back Scale: [ S, ST, T ]
Back: Equivalents table.
Gift Of Philip E. Stanley of Worcester, Mass.


X-Act No.222P 5.5-in (Rebranded for ALVIN)

ISRM 22.03.01.102

Replace 09.01.12.05
X-Act No.222P 5.5-in (Rebranded for ALVIN)
Made by Denmark - Similar to UTO models, but cursor not interchangeable.
Front Scale: 5.5in // K, A[ B, CI, C ] D, L
Back Scale: [ S, ST, T ]
Back: Equivalents table.
Gift Of Philip E. Stanley of Worcester, Mass.

Copyright © 2003-
International Slide Rule Museum