Hackaday Prize Entry: Bellcycles are Open-Source, Compact, and Unique

What do we want in a bicycle? It should be able to be constructed at home, even if your home is a New York apartment. It should be Open Source so our friends can make their own. It should be compact so it won’t clutter up our little apartments. It should be unique instead of another me-too. [Alex Bell], of Bellcycles, is showing off his bicycle on hackaday.io and it fills all the requirements.

The unusual shape drastically reduces the size, turning radius, and storage footprint from a traditional bicycle. It shares the large front wheel design of the penny …read more

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Harmonographs Generate Geometric Images Unique as Fingerprints

When my elder brother and I were kids back in the late 1970’s, our hacker Dad showed us this 1960-61 catalog of the Atlas Lighting Co (later Thorn Lighting) with an interesting graphic design on the cover. He told us to do a thought experiment, asking us to figure out how it would be possible to have a machine that would draw the design on that catalog cover.

Incorrectly, our first thought was that the design was created with a Spirograph. A spirograph has two main parts: a large ring with gear teeth on the inside and outside circumferences and …read more

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