Not sure where this is from, but I love it.
sine vs. cosine
Update: Mike pointed out in the comments that it's sometimes called a "bullshit grinder" which lead me to a Wikipedia article with a little more information.
sine vs. cosine
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Michal Migurski
They used to sell these at a knickknack store in New Haven when I was a kid, under the name "bullshit grinder".
sunday
may, 18 2008
britta
ooh! reminds me of one of my favorite wikipedia animations: http://en.wikipedia.org/wiki/Image:Geneva_mechanism_6spoke_animation.gif (see also: http://genevamechanism.ytmnd.com/)
sunday
may, 18 2008
andy
I have a wooden one of those.
sunday
may, 18 2008