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!
2022 was the 400th anniversary of the slide rule as described by Willaim Oughtred.
2022 was also the 50th anniversary of the HP-35 Electronic Slide Rule Calculator.
Visit What's New! for the latest additions to the galleries and changes to the website.
News for Friends of the Museum
2023 Special Fund Raiser for capital Equipment - Completed, Thank you!
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!
Students from the Collège André-Grasset in Montreal, Canada using slide rules donated by ISRM. Click on the banner for more information.
International Slide Rule Museum Contact: