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Slide Rule Gift Store
Duplicates Looking for a Good Home
and other Opportunities to support ISRM's Mission
KEEP ISRM FREE!
Donations are
tax deductable
Duplicate Slide Rules at ISRM All purchases and fees on this page go toward maintaining the museum website and supporting the Slide Rule Loaner Program for Schools. The specimens they replace, however, may be items in the fund raiser. The recommended fee is based on the average total cost of ebay sales for similar specimens over the past two years. 100% satisfaction. All returns accepted, just pay return postage. If you wish to contact me directly and offer a different amount, we will work with you to serve both our needs. Call the Curator, Michael Konshak, at 303-921-8709 days and evenings

Duplicate slide rules available for a recommended donation have been listed.
View the page of the available duplicates for sale.

Adoption Instructions

  1. View the list of the candidates for consideration. The file has hyperlinks to the exact model shown in the gallery for your comparison. In most cases, the duplicate slide rule is as good or better than the ISRM archive specimen. Exceptions are noted.
  2. Make a list of the slide rules that you desire.
  3. If you wish to make a counter-offer to the recommended adoption fee, email the curator with your list and offer.
  4. Total up the recommended adoption fees for each item plus the shipping fee, and enter it in using the Secure Donation button on the right.
    • Single and multiple small slide rules can normally fit in a USPS Padded Flat Rate Envelope (9-1/2" x 12-1/2") for $9.00
    • Multiple 10 inch slide rules, up to 25 pieces, can normally fit in a USPS Flat Rate Box (11" x 8-1/2" x 5-1/2 or 13-5/8" x 11-7/8" x 3-3/8") for $16.00
    • Please include your mailing address in an email or in the Paypal notes, as Paypal will not include it
    • International Adoptions: Individual slide rules can be shipped outside the United States for $36.70 using a USPS Priority Mail padded envelope.
  5. Email or call Michael, if you run into problems please.
It takes a bit of time for the Curator to respond so, if for some reason, the slide rule has already been adopted, you'll be emailed to see if there is another slide rule that you want to rescue, switch to a direct donation, or get a refund. Personal checks are also accepted. Thanks for your support!

The Secure Donations button allows you to direct your donation to the following ISRM programs.

  • Slide Rule Adoption Fees
  • Gift from Friends of the Museum
  • Free File Downloads Gratuity
  • Cash Gift - New ISRM Friend
  • School Loaner Program Support

Use the secure button, and include a donation for shipping costs List the items by ISRM reference #. in the message to curator.

ISRM Souvenir Shop


You can now buy t-shirts, mugs & gifts with the ISRM Logo from the museum's souvenir shop hosted by Cafe Press.

Amazon Smile

Something new for our supporters to consider now that the International Slide Rule Museum is a 501(c)(3) non profit corporation. ISRM is approved to be on Amazon's Smile program. If you shop on Amazon, consider using smile.amazon.com for your on-line purchases.

How does AmazonSmile work?

When first visiting AmazonSmile, customers are prompted to select a charitable organization from over one million eligible organizations. In order to browse or shop at AmazonSmile, customers must first select a charitable organization. For eligible purchases at AmazonSmile, the AmazonSmile Foundation will donate 0.5% of the purchase price to the customer's selected charitable organization.

What is the AmazonSmile Foundation?

The AmazonSmile Foundation is a 501(c)(3) private foundation created by Amazon to administer the AmazonSmile program. All donation amounts generated by the AmazonSmile program are remitted to the AmazonSmile Foundation. In turn, the AmazonSmile Foundation donates those amounts to the charitable organizations selected by our customers. Amazon pays all expenses of the AmazonSmile Foundation; they are not deducted from the donation amounts generated by purchases on AmazonSmile.

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International Slide Rule Museum