Welcome!

International Slide Rule Museum (ISRM)

ISRM is the world's largest free digital repository of all things concerning slide rules and other math artifacts.

ISRM is an IRS 501(c)(3) (A57 - Science and Technology Museums) non-profit corporation through the State of Colorado. Colorado ID Number 20181884948, IRS EIN 83-2486423. - ISRM Advisory Board of Directors.

KEEP ISRM FREE!
Donations are
tax deductable
Post and Chat on

ISRM @sliderulemuseum

ISRM Android App

Instagram page

For all those concerned: The ISRM Archives survived the Marshall Fire in Boulder County Colorado on Thursday, December 30. Although 1400 structures were lost in Superior and Louisville, ISRM was a half mile away when the 100+ MPH winds stopped. That evening the storm front dropped 8 inches of snow on the area. Life (for ISRM) is back to normal. Thankfully, we preserved the ISRM library for such an event in the ISRM Slide Rule Instructions Library (22 Volumes) on Amazon, but archives would have been lost.

Click the Slide Rule for Introduction, ISRM Mission Statement, and Donation Policies.
Visit What's New! for the latest additions to the galleries and changes to the website.
ISRM is best viewed on a desktop. Clear your browser cache often CTRL+F5

NEW! ISRM Slide Rule Instructions Library is now published on Amazon.
Twenty-one 550 page Volumes of all known brands, country or language (see below). Download the Table of Contents of all 22 Volumes.

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.

Abacus/Sorobans
Abaci Ephemera
Addiators/Troncets
Aerospace
Acu-Rule/Acu-Math
ALRO
Americas/Mex/S.A.
Aristo - D&P
Associates
Australia/NZ
Blundell/BRL

Calculators
Circular
Charvoz-Roos
China/East Asia)
Comics w/SRs
Concise
Demonstration
Dietzgen
Eastern Europe
Ephemera w/SRs
Faber-Castell

France/Belgium
Germany/DDR
Gilson
Graphoplex
Hemmi
HSR Catalogue
Italy/Spain
Japan
K&E Standard
K&E Specialty
Lawrence
Military

Nestler
Netherlands
Nordic (DK/SE)
Novelty SRs
People w/SRs
Pencil SRs
Pickett
PIC/Thornton
Pocket Watches
Post
Rarities (Olde)

Relay/Ricoh
Richardson
SIC SINCO
Slide Charts
Sterling
Switzerland/CURTA
Unique
United Kingdom
United States
USSR-Soviet Era
Who's Who

Slide Rule Library

Scans of slide rule manuals and text books are organized into one of 15 areas:

Library Main Desk
Catalogs/Brochures
Elect. Calculators

General Purpose
Books and Text
United States

Russia/China
Japan
British/Australia

Europe/S.A.
Pickett
Post/Hemmi

Kueffel &Esser
Dietzgen
White Papers

Addditional Slide Rule Resources

Slide Rule Course,
How to Use a SR


SR Glossary
and Encyclopedia

Historical Photos
Print Media/Ads

Slide Rule Patents
Worldwide

Loaner Program
For Class Work


NEW! Restoration
of Slide Rules
Replica Cursor Parts

Slide Rule Dates
Determine the Age


Slide Rule Scales
Build Your Own SR

Slide Rule Links
Past Ebay Prices

ISRM Associates
Hosted Collections


New - Slide Rule Instructions from the ISRM Library

Download the Table of Contents of all 22 Volumes.
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.
Volume 1

HEMMI
Volume 2

KEUFFEL & ESSER
Volume 3

PICKETT
Volume 4

POST
Volume 5

DIETZGEN
Volume 6

Japanese OEM

Includes Ricoh, Fuji, Concise, SIC, etc.
Volume 7

ARISTO

Dennert & Pape
Volume 8

FABER-CASTELL

Volume 9

NESTLER

Volume 10

ESPAÑOL

All Instructions in Spanish
Volume 11

DEUTSCH

All instructions in German
Volume 12

AMERICAN

Misc. Brands
Volume 13

BRITISH

Volume 14

POCKET-WATCH

Volume 15

ELECTRICAL & RADIO

Volume 16

AIR & SEA NAVIGATION

Volume 17

FRANCAIS

All instructions in French
Volume 18

MILITARY & AEROSPACE

Volume 19

CIVIL AND INDUSTRIAL

Volume 20

MISCELLANY AND RARE

Volume 21

RUSSIAN CYRILLIC

All Instructions in Cyrillic
Volume 22
CHINESE HàNZÌ
All instructions in Chinese
Volume 23

TBD (HP ESR?)
Volume 24

TBD (TI ESR?)

Public Displays
and Exhibits

News for Friends of the Museum

NEW MEET ID!! On-line virtual face-to-face coffee.social get together.
Three times/week. Two times on Wednesday and once on Saturday
  • 2nd shift: WED. at 9 PM Mountain Time (4 AM UTC THU.)
  • 1st shift: WED. at 9 AM Mountain Time (4 PM UTC WED.)
  • Weekend 3rd shift: SAT. at 9 AM Mountain Time (4 PM UTC SAT.)
The meeting are put into three sessions because of Google Meet's one-hour limitations on a free account (Google will give use a 5-minute-warning as the end approaches): Or use a tiny URL link, which is easy to remember:

1 donors 25% of goal as of Jan 4, 2022

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 19th 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 purchase t-shirts, mugs & gifts with the ISRM Logo from the museum's souvenir shop.


NEW! You can get custom wall clocks with images of popular circular slide rule models. These were inspired by the Friends of the Museum that come to the weekly social hours. So far ISRM has created face of Gilson (yellow and green), Concise 270N, Pickett 110-ES, Alro 100R, Dalton Dead Reckoning Computer E6-B (White and Black) and the B-47/B-52 Air Nav & Bombing Computer, as well as clocks using the ISRM logo.


Students from the Collège André-Grasset in Montreal, Canada 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:


Copyright © 2003-

International Slide Rule Museum


VISITORS FROM AROUND THE WORLD
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

1956 Edwards AFB
Test Pilot School


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)

1980's "Startrek" TV Re-Runs

1995"Tuskegee Airmen" Movie Scene

1997MIT SR Class

2006 UCSD SR Intro

Present Collector