The mathematics collections document the stories of several of these objects individually, including pens and pencils, dividers and compasses, squares and triangles, protractors, parallel rules, ...
But some companies are trying something interesting: foldable phones. Although a foldable phone is not that practical (and most are way too expensive) for most people, a phone that can transform ...
Viking traders carried a set of folding scales which they used to weigh coins to make sure they got a fair deal. The Oseberg ship was found in 1904 and is now in a museum in Oslo, Norway.
Each project includes at least one Section too, which contains drawings and can be collapsed with a tap like folding from the heading ... and specify a scale setting and the measurement units used.
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