spring

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A labeled architectural diagram of a circular arch shows the keystone at the top center, wedge-shaped voussoirs forming the curve, and vertical supports on each side, with lines marking the radius and springing line.

spring

architecture

Also known as: springing

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The Information Architects of Encyclopaedia Britannica

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arch
…supports is known as the spring, or springing line. During construction of an arch, the voussoirs require support from below until the keystone has been set in place; this support usually takes the form of temporary wooden centring. The curve in an arch may be semicircular, segmental (consisting of less…
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…supports is known as the spring, or springing line. During construction of an arch, the voussoirs require support from below until the keystone has been set in place; this support usually takes the form of temporary wooden centring. The curve in an arch may be semicircular, segmental (consisting of less…
Read More