Visual Dictionary Flashcards
Wedge shaped. Serving to lock other voussoirs in place
Keystone
Exterior curve in an arch
Extrados
Inner curve or surface of an arch
Intrados
Height of an arch from springing line
Rise
First voussoir sitting on the impost of an arch
Springer
Point which an arch rises from its support
Spring
Wedge shape units in a masonry arch or vault
Voussoir
Semicircular intrados
Roman Arch
Arch struck from one or more centers below the springing line
Segmental arch
Three centered arch having cusped intrados
Trefoil
A pointed arch having two centers and radii equal to the span
Equilateral arch
Arch having two centers and radii greater than the span
Lancet arch
Pointed arch having two centers less than the span
Drop arch
Four centered arch having an inner pair of curves with a radius much greater than that of the outer pair
Tudor arch
Pointed arch, each haunch of which is a double curved
Ogee arch