The Slide Rule: A Gift of Learning and Remembrance

I have something special to share, particularly for those who enjoy mathematics, history, or discovering how things worked before electronic calculators. A friend of mine created a Windows application called The Slide Rule, available through GameShoutOut in the Microsoft Store. From October 31 through November 24, she is giving away 1,000 copies, normally priced at $9.99 each, in celebration of her parents’ lives.

There is a lovely story behind this application. Her father was an engineer who owned quite a collection of slide rules. After he passed away, she began thinking about those instruments and decided to learn how to use one herself. She discovered just how clever they were, but also how challenging they could be for someone unfamiliar with their scales and movements.

That experience inspired her to create something that would make slide rules easier to understand and more enjoyable to learn. The result was The Slide Rule, an interactive application that recreates the instrument while teaching people how to use it.

For those unfamiliar with slide rules, these remarkable instruments helped generations of engineers, scientists, and students perform calculations long before electronic calculators existed. By moving carefully marked scales against one another, they could multiply, divide, calculate square roots, and solve problems involving logarithms and trigonometry.

The Slide Rule offers three different ways to explore this fascinating piece of mathematical history.

Classic Mode recreates a traditional slide rule, complete with a movable slide and glass-style cursor. You can move the pieces just as you would on a physical instrument, zoom in to examine the markings, and see live readings from the scales. It is a wonderful way to become familiar with how everything works.

Learn Mode includes thirteen interactive lessons, beginning with reading the scales and progressing to more advanced calculations. The application guides you through each movement, checks your work, and includes quizzes that encourage you to find the answers yourself. Your progress is saved, and you can even create your own lessons.

Modern Mode may be the most intriguing feature. You can type in a calculation, such as 2.4 multiplied by 3.5 or the square root of 17, and watch the slide rule demonstrate how to solve it. The instrument moves through each step while explanations show what is happening. You can pause, advance at your own pace, and compare the slide rule’s approximate result with the exact answer.

I particularly like the idea of having a real slide rule beside your computer while using this feature. Imagine watching the digital version demonstrate a calculation, then picking up the physical instrument and repeating those movements yourself. It could be a lovely way to finally understand an old slide rule that has been sitting in a drawer for years.

The application includes both a traditional four-scale slide rule and an extended ten-scale version for more advanced mathematics. You can also choose between three attractive finishes: heritage ivory, modern graphite, and warm maple and walnut. The graphics remain crisp even when enlarged.

What makes this giveaway especially meaningful is the inspiration behind it. Her father’s engineering background and collection of slide rules inspired the application, while her mother’s kindness and support inspired the decision to share it with others. Giving away 1,000 copies seemed like a fitting way to celebrate both of their lives.

The giveaway runs from October 31 through November 24, or until all 1,000 copies have been claimed. At its regular price of $9.99, this represents nearly $10,000 worth of educational software being shared with anyone curious enough to give it a try.

Perhaps you remember using a slide rule in school, have one that belonged to a family member, or simply enjoy discovering how people solved problems before computers. I hope you will consider trying The Slide Rule and sharing this opportunity with teachers, students, engineers, homeschool families, and anyone who loves learning something new.

You can find The Slide Rule in the Microsoft Store here: https://apps.microsoft.com/detail/9n9mx4cq6drl?hl=en-US&gl=US

A father’s collection inspired a new way to learn. A mother’s kindness inspired a gift to others. And now a little piece of mathematical history has the opportunity to find its way into a thousand more homes.

I think that is a lovely way to celebrate two lives.