Help us in our Fund Raiser by Adopting lonely slide rules.
Slide Rule Galleries
All slide rule specimens, scans, photos and ephemera are organized into one of 51 galleries; by major
manufacturer, construction style, country/region, time period or application. Scroll down on the MENU on the left to go directly to a particular brand or to see other data.
Slide Rule Library
Scans of slide rule manuals and text books are organized into one of 15 areas:
Addditional Slide Rule Resources
New - Slide Rule Instructions from the ISRM Library
Every one of the 540-550 page Volumes contain most of the popular models from each of the brands, and are
available in paperback or hardcover on Amazon, which will print to order in 7 countries. Click on the covers
to go to the relevant page on Amazon to review and purchase the Volumes.The small royalty goes to support ISRM.
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Public Displays
and Exhibits
News for Friends of the Museum
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On-line virtual face-to-face coffee.social get together.
Three times/week. Two times on Wednesday and once on Saturday
Go to link: meet.google.com/cms-vtny-yvg or tinyurl.com/isrm-meetup (easier to remember).
- Weekend 3rd shift: SAT. at 9 AM MDT (3 PM UTC SAT.)
- 2nd shift: WED. at 9 PM MDT (3 AM UTC THU.)
- 1st shift: WED. at 9 AM MDT (3 PM UTC WED.)
or just drop by. I just may have the meeting page open if you have a question for me!
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| 26 donors
| 57% of goal - as of June 24, 2021 |
2021 Annual Fund Raiser - ISRM needs to raise a minimum of $2000 annually, necessary for its programs, exhibits,and ongoing web maintenance. All donations are tax deductable. In our 18th year of being on-line, we have data being downloaded from 118 countries, all at no cost to you! There are no paid staff members, but we need help in keeping ISRM growing and on-line during these challenging times. In 2011 ISRM established a FRIENDS OF THE MUSEUM page to acknowledge its many supporters. You can become a TIER 1 FRIEND OF THE MUSEUM by your donation through Paypal or by check. You can also help by participating in ISRM's Slide Rule Rescue program where you can adopt slide rules. Note that ISRM is a 501(c)(3) non-profit so cash donations are tax deductable. Thank you for your welcome support and kind consideration!
Mail checks or donated items to: ISRM, 1944 Quail Circle, Louisville, CO 80027, USA.
You can now buy t-shirts, mugs & gifts with the ISRM Logo from the museum's souvenir shop.
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2012 marked the 40th anniversary of the HP-35 'Slide Rule' Calculator
(and the beginning of the end of the slide rule industry by 1977).
The release of the Hewlett-Packard HP-35 occured on Febuary 1, 1972. the HP-35, named for the number of keys on the calculator, was the single most instigator of the demise of the slide rule as we know it, even though the introductory price was $395.00 or $4000 in 2012 money. Within months, Texas Instruments released the TI-2500 4-function calculator and the SR-10 slide rule calculator.
Visit ISRM's Gallery of Slide Rule Calculators from 1972-1980 which includes related ephemera and advertisements.
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Interesting Features at ISRM
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There is a Search Engine for this website
which will assist you in your research of slide rules. This Search engine is provided by
JRank
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The Slide Rule Scales can be used to
build your own slide rule. The latest uses a CD/DVD case to support a circular slide rule (by Ying Hum of Canada)
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Technical Slide Charts and Disks. Over
700 pre-programmed calculators made of cardboard or plastic film for designed for specific
repetitive tasks and offered as promotional items.
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The Slide Rule Who's Who - Past and Present gallery shows
slide rule manufacturers, inventors, dealers and active collectors and donors to ISRM.
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Visit the galleries of Historical Photos of People and Ephemera and Comics which have over
1000 Photographs, Advertisments, Cartoons and News articles showing slide rules in action. It is constantly being expanded.Also see Ephemera related to Electronic slide rule calculators and Abaci
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The Patent Database. gallery is useful for research. Downloadable Patents as early as 1851 to the present day, involving logarithmic calculating devices.
There are currently over 900 worldwide Patents available for downloading in PDF file format.European patents are sadly incomplete at this time.
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The gallery of Herman van Herwijnen's Slide Rule Catalogue
has clickable thumbnails to over 2200 slide rules and slide charts.
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The ISRM's Free Slide Rule School Loaner Program now has many
new sets for use in the USA, Germany, Netherlands and Japan. Teachers may now keep them out for
a full semester! The program has been expanded to include Home Schoolers.
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Free Web Hosting for ISRM Associates Put your collection here!
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Students from the Collège André-Grasset in Montreal, Canada using slide rules donated by ISRM. Click on the banner for more information.
Students from the University of Waterloo in Ontario, Canada created an exhibit for the annual Knowledge
Integration (KI-X 2011) exhibit using slide rules donated by ISRM. Click on the banner for more information.
Dr. Barbara Rooker of the Joplin, Missouri K12 School System, introduced students to slide rule math during 2009 using ISRM's free loaner program. Click banner for more pictures:
Modern Logo's depicting Slide Rules
USAF Test Pilot School Patch, Edwards AFB, California
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Joe Miner, Official Mascot of University of Missouri-Rolla, now the Missouri University of Science and Technology
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Purdue Engineer's Yell (1960's)
e to the x, dy, dx
e to the x, dx
cosine secant tangent sine
three point one four one five nine
square root, cube root, Btu
slipstick, slide rule, Yay Purdue
Contributed by Bruce Chelf,
Purdue Alumnus (The ISRM curator
subsitutes CSU for Purdue)
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U.S.S. Wayne E. Meyer COA. Slide rule shown on book
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Slide Rule Wallpaper
This wallpaper is a collage of many slide rules. It is 1240 x 1020, 582kb and I have almost every slide rule manufacturer and country represented. Save this file (Right-Click Save Target) and select it using for the background on your computer monitor. 'Right-Click' on your screen and select 'Properties', then 'Browse' to the file to change your wallpaper. I hope you enjoy it.
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Slide Rule Competitions
Gold: Werner H. Rudowski(center)
Silver: Jörn Lütjens (right)
Bronze: Klaus G. Krämer (left)
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The Deutschsprachigen Rechenschieber-Sammler RST (German speaking Slide Rule Collectors) held its 23rd annual meeting in Altona (Hamburg) Germany on April 14, 2012 and hosted the 2012 'truly'
International Slide Rule Championships, the first one to be held in Europe. 15 of the 40 slide rule collectors, 5 countries (Germany, Switzerland, The Netherlands, Luxembourg, and Finland) volunteered in participating in the International Slide Rule contest (Continental European) 2012, which was performed for the first time. The main profession of the contesters were (retired) engineers, 2 active pilots, and teachers. All the participants received an ARISTO Darmstadt 967 slide rule and had to solve 10 problems within 30 minutes.
The champion, Werner H. Rudowski won with with 10 (all) solutions solved followed by Jörn Lütjens with 9.5 solutions and Klaus G. Krämer with 9 solutions. Congratulations all!
Any collector group, school or engineering association are
invited to host an ISRC contest.
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ISRM is administering the International Slide Rule Championships.
Any collector group, school or engineering association are invited to participate. Problem sets provided by
ISRM as well as the Medals to be awarded to the local champions, FREE! The first innagural contest in was Rose Suarez's Mathematics and Research Class in Half Hollow Hills, NY. (on Left). Kristen Fouss's Pre-calculus class at Anderson HS in Cincinnati, Ohio also had champions (on right).
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Copyright © 2003-
International Slide Rule Museum 
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Proud Member of
1550-1617
John Napier
Invented the Logarithm in 1614
1574-1660
William Oughtred
Inventor of the Slide Rule
1831-1906
Victor Amédée Mannheim standardized modern scales
c1890
DUPA (Aristo) Class Germany
c1900
Englewood (NY) High School Students
c1905
IIT Classroom
1909
IIT Elect. Engineers
1934
Iowa State SR Class
1941
IIT Engineering
1942
Purdue Aeronautics
1950 African-American Students.Prarie View, TX. Texas A&M
1952 Edwards AFB
Test Pilot School
1954 Hamburg, Germany
1957 Robert Herndon, Aircraft Engineer (Life Magazine)
1965 NCF Math Class
1969 Buzz Aldrin on Apollo 11 Moon Mission (NASA)
1970 Colorado School of Mines
1976 Joe Pasquale (right) Weehawken HS, NJ now a Professor at UCSD
1980's "Startrek" TV Re-Runs
Present Collector
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1550-1617
John Napier
Invented the Logarithm in 1614
