springing line

noun, Architecture.

a horizontal line between the springs of an arch or dome.

the rise or the angle of the rise of an arch.

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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples

To distribute the skip cars along the work a trestle was built close alongside the bridge and at about springing line level.

Concrete Construction Halbert P. Gillette
The length of the longest bridge is 3,000 feet and the span of the arches at the springing line is fifty-six feet.

History of Sanitation John Joseph Cosgrove
These joints in the arch were not allowed to be made above a point 60 above the springing line.

Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 F. Lavis

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