Cut-out templates, information, and exercises for making a paper or cardboard circular sliderule that can do multiplication, division, cube/square roots, circle problems, 3-stage multiplication, and ratios/conversions (likes kilometers to miles).
Web site: https://cardboard-computer.org
User guide: https://cardboard-computer.org/guide.html
Cut-out templates: https://cardboard-computer.org/templates.html
(Note: you will also need to copy some style rules from docs/style.css — I'll fix that later.)
The main code is in docs/modules/cardboard-computer.js
To build a new circular sliderule (CardboardComputer), create an element like this in your HTML:
<figure id="sliderule"></figure>
Then include the CardBoardComputer like this
<script type="text/javascript" defer="defer">
import("./modules/cardboard-computer.js").then((cc) => {
new cc.CardboardComputer("sliderule", { advanced: false });
});
</script>
To use the advanced version, change the advanced option from false to true.
To add an interactive demo, create a second element in your HTML, like this:
<figure id="demo"></figure>
and change your import to
<script type="text/javascript" defer="defer">
import("./modules/cardboard-computer.js").then((cc) => {
new cc.CardboardComputer("sliderule", { advanced: false }).activateDemo("demo");
});
</script>
Created by David Megginson, starting in March 2024.
The CardboardComputer is released into the Public Domain, and comes with NO WARRANTY. See UNLICENCE.md for details.