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In architecture the springing line of an arch (spring of an arch) is the horizontal line drawn through the junction of the vertical face of the impost with the curve of the intrados.
Research Springing line of an Arch
 
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2010 The Probert Encyclopaedia
Southampton, United Kingdom
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