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Line 18: ==Size and materials== [[File:Celt with weights of gemstone turtles-01.jpg\|thumb\|Carved wooden rattleback]] Rattleback [[artifact (archaeology)\|artifact]]s are typically stone and come in various sizes. Modern ones sold as novelty puzzles and toys are generally made of plastic, wood, or glass, and come in sizes from a few inches up to {{convert\|12~~ inches/30 cm~~\|in}} long. A rattleback can also be made by bending a spoon.<ref>{{Cite web\|url=http://www.exo.net/~pauld/TomTits2000/europetrip/technorama%20lecture/technoramalecture.html\|title=Technoramalecture}}</ref> Larger rattlebacks (up to {{cvt\|8~~ feet/2.40 m~~\|ft\|disp=sqbr}} long and {{cvt\|16~~ inches/0.8 m~~\|in\|disp=sqbr}} wide) are made on request by Emmanuel Peluchon for science museums.<ref>{{cite web\|url=http://boisselier.ca/en/products-page/curiosities/\|title=Rattlebacks, puzzles and musical tree by Emmanuel Peluchon\|website=boisselier.ca}}</ref> Two rattleback design types exist: they have either an asymmetrical base with a skewed rolling axis, or a symmetrical base with offset weighting at the ends.

Rattleback: Difference between revisions