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Vocabulary

KEYSTONE - 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...


Gothic (Pointed)

Ogee

Round

Segmental

Tudor