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jack arch

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flat arch
flat arch
An arch whose soffit (i.e., lower face) is horizontal. Also called a Dutch arch, French arch, jack arch, or straight arch.
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The marvellous invention of the jack arch (a combination of brick vaulting stiffened by wrought iron or steel beams and often supported on cast iron columns) allowed new perceptions of mass carried apparently effortlessly -- potentially as powerful a spatial device as the dome floated over Hagia Sophia by Isodorus of Miletus and Anthemios of Tralles.
Building with metal: metals have been used in buildings for more than ... by Davey, Peter / The Architectural Review
 
 
 
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