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VocabularyKEYSTONE - the central stone of an arch or vault. VOUSSOIRS - stones than make the arch (usually brick or wedge-shaped). IMPOST - the part of the arch's wall (usually molding) on which the arch rests. ABUTMENT - the part of the arch's wall which balances the force of gravity the arch makes (thrust) . CENTER - the center point of the arch. SPAN - the width of the arch's opening. HAUNCH - the part of the arch's wall which experiences the most thrust. CROWN - the top part of an arch.
Some arch examples...
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