Thanks so much for the 2007 article on Make your own 1952 Fraction-of-an-inch Adding Machine. I inherited one of these and was delighted to find information about it on your web site. Now that I have explored your web site a bit, I am adding it to my favorites!
Last fall, we built an oversized Digi-Comp II for MIT, which we’ll be posting about in the near future. Today, MIT computer science professor Scott Aaronson published a short “paperlet” about the computational capabilities of the Digi-Comp II on his blog, Shtetl-Optimized:
…it’s amazing that such a simple contraption of balls and toggles could already take us over the threshold of universality. Universality would immediately explain why the Digi-Comp is capable of multiplication, division, sorting, and so on. If, on the other hand, we don’t have universality, that too is extremely interesting—for we’d then face the challenge of explaining how the Digi-Comp can do so many things without being universal.
Or, if you prefer, we’re halfway (well, 44% of the way) to Tau day, 6/28. A fine day to watch the Vi Hart‘s Anti-Pi Rant. And, a fine day to round up some of our finest Pi, Pie, and mathematics projects:
Our friend John made Sconic Sections for a dinner party, with a slight variation: he baked the scone dough in ice cream cones. That led to a little bit of extra difficulty in slicing them, but the cone also provided an outline for the ellipses, hyperbolas and parabolas.
Cliff came with an esoteric dilemma: how to engrave a glass Klein bottle. Acme Klein bottles are blown from borosilicate (Pyrex) glass, which has a low coefficient of thermal expansion, which means that the usual way of engraving a curved glass surface—laser engraving—doesn’t actually work. With more common types of glass, you can use a laser engraver to etch anything you want into the surface. But with Pyrex, the surface simply melts unevenly rather than creating the microfractures that give an etched appearance.
There was one complication, which is that a Klein bottle is a funny shaped object! In order to fixture the Klein bottle in the Eggbot, we made a couple of extra large couplers—much larger than the tiny pads normally used to hold the ends of an egg—with EVA foam rubber pads on their surfaces. The extra large couplers held the Klein bottle securely for rotation.
We did some initial tests with Sharpie and a medium sized Klein bottle to make sure our fixturing worked well.
And then we hooked up an engraver for a real test.
Here’s what the Klein bottle looked like after engraving. Not being particularly creative, we etched the word “KLEIN” into the side. Because the Klein bottle is made from thick borosilicate glass, it takes engraving remarkably well. It is a much more sturdy object than the fragile Christmas ornaments that we have engraved in the past.
While we can’t imagine that it is a major market segment, the Eggbot seems to be ideal for working with Klein bottles (insomuch as anything can be perfect for working with a closed, non-orientable, boundary-free manifold). But regardless, it’s quite wonderful to find an unexpected application like this, where our little robot can solve a real-world problem that we had never even considered.
Today we’re thrilled to be launching our newest kit: the WaterColorBot.
The WaterColorBot is a brand-new project from Evil Mad Scientist Laboratories and Super Awesome Sylvia — a friendly art robot that moves a paint brush to paint your digital artwork onto paper, using a set of watercolor paints.
We’ve previously written about how we got started on this project (in a guest post by Sylvia), and about Sylvia’s visit to the White House Science Fair, where she was able to give President Obama a personal demonstration of the WaterColorBot.
And now, you can get one too! We’re launching the WaterColorBot today on Kickstarter, and we’d like to ask for your support in getting it out there. The WaterColorBot is an enormously powerful tool for helping to get young people interested in technology:
Beyond simple fun, we think that the WaterColorBot has enormous potential for STEM and STEAM education, especially as a way to get young people engaged with hands-on technology and robotics. We are particularly interested finding ways to inspire young women to pursue careers in science and technology. We cannot imagine any better way to do so, than starting with a robot co-designed by a 12 year old girl.
Perhaps more than anything else that we’ve done, we think that the WaterColorBot really can make the world a better place, one (young) Evil Mad Scientist at a time.
The scone is a classic single-serving quick bread that is often served with breakfast or tea.
And, at the intersection of the two, we present something entirely new, delightfully educational, and remarkably tasty: Sconic Sections.
In what follows, we’ll show you how to bake cone-shaped scones, to slice them into plane geometric curves, and to highlight those curves by selective application of toppings. We’ll also discuss some of the methods that didn’t work so well, as we refined our methods for making these.
Onwards, towards parabolic preserves and hyperbolic Nutella!