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==Disposable formers== [[File:Brady 45' catamaran - formers.jpg|thumb|Plywood formers awaiting the application of strip planks on a strip-built catamaran.]] A former may instead be a temporary shape over which a structure is built, the former subsequently being discarded in whole or part, as follows: *[[Strip-built]] boat construction uses formers over which thin plank strips are applied and glued.<ref>[https://www.glen-l.com/methods/methdstr.html Boat building with strip planking]</ref> In some cases, some of the formers may be incorporated as structural ribs. * In [[civil engineering]], [[Bridge|bridge building]], and [[architecture]], arches may be built upon a wooden former, which is removed once the [[Keystone (architecture)|keystone]] is securely in place.
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