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What is "springing line of an arch"

The Collaborative International Dictionary
Springing line of an arch

Springing \Spring"ing\, n.

  1. The act or process of one who, or that which, springs.

  2. Growth; increase; also, that which springs up; a shoot; a plant.

    Thou blessest the springing thereof.
    --Ps. lxv. 10.

    Springing line of an arch (Arch.), the horizontal line drawn through the junction of the vertical face of the impost with the curve of the intrados; -- called also spring of an arch.