Ogee

An ogee (/oʊˈdʒiː/ /ˈoʊdʒiː/) is an object, element, or curve—often seen in architecture and building trades—that has a serpentine- or extended S-shape (sigmoid).^[1]^: 218 Ogees consist of a "double curve", the combination of two semicircular^{[citation needed]} curves or arcs that, as a result of a point of inflection from concave to convex or vice versa,^[1]^: 218 have ends of the overall curve that point in opposite directions (and have tangents that are approximately parallel).^{[citation needed]}

First seen in textiles in the 12th century, the use of ogee elements—in particular, in the design of arches—has been said to characterise various Gothic and Gothic Revival architectural styles.^[1]^: 218 The shape has many such uses in architecture from those periods to the present day, including in the ogee arch in these architectural styles,^[1]^: 218 where two ogees oriented as mirror images compose the sides of the arch,^[3] and in decorative molding designs, where single ogees are common profiles (see opening image).^[1] The term is also used in marine construction.^{[citation needed]} The word was sometimes abbreviated as o-g as early as the 18th century,^[1]^: 218 and in millwork trades associated with building construction, ogee is still sometimes written similarly (e.g., as O.G.).^{[citation needed]}

^ ^a ^b ^c ^d ^e ^f ^g ^h As described in Lewis, Philippa & Darley, Gillian (1986). Dictionary of Ornament. New York: Pantheon Books. pp. 218, 222, 73, 97, and 116. ISBN 0-394-50931-5. Retrieved January 9, 2020. ogee. Combination of a concave and convex line, two recurve shapes, producing a serpentine shape, either as a moulding (an S form in cross section) or as an elaborated pointed arch. It is particularly characteristic of the Venetian Gothic Revival, Gothick and Gothic Revival styles, although ogee forms appeared in textiles from the 12th century. In the 18th century the word was sometimes written as o-g. A nodding ogee is an arch in which the head projects. See also syma recta/reversa; keel moulding. [p. 218] / ovolo. Convex moulding (usually a quarter of a circle in section)... [p. 222] / cavetto moulding or hollow chamfering (Latin, cavare, to hollow). One of the principal forms of moulding, a concave version of the ovolo moulding, usually a quarter of a circle in section. [p. 73] / cyma recta (Latin, cyma, wave). Important compound moulding, combining the ovolo and cavetto with the convex moulding below. In section the moulding is a double curve, concave above, convex below. Also known as ogee moulding. cyma reversa... [presenting concave below, convex above, p. 97]{{cite book}}: CS1 maint: multiple names: authors list (link)
^ The ogees are the nonlinear parts of the profile, only; the shaded area represents the side of the molding facing the wall of the building's room that is being decorated.
^ Davies, Nikolas; Jokiniemi, Erkki (2011). Architect's Illustrated Pocket Dictionary. Oxford, England: Architectural Press. p. 318. ISBN 9780080965376.

[LewisDarley1986-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h As described in Lewis, Philippa & Darley, Gillian (1986). Dictionary of Ornament. New York: Pantheon Books. pp. 218, 222, 73, 97, and 116. ISBN 0-394-50931-5. Retrieved January 9, 2020. ogee. Combination of a concave and convex line, two recurve shapes, producing a serpentine shape, either as a moulding (an S form in cross section) or as an elaborated pointed arch. It is particularly characteristic of the Venetian Gothic Revival, Gothick and Gothic Revival styles, although ogee forms appeared in textiles from the 12th century. In the 18th century the word was sometimes written as o-g. A nodding ogee is an arch in which the head projects. See also syma recta/reversa; keel moulding. [p. 218] / ovolo. Convex moulding (usually a quarter of a circle in section)... [p. 222] / cavetto moulding or hollow chamfering (Latin, cavare, to hollow). One of the principal forms of moulding, a concave version of the ovolo moulding, usually a quarter of a circle in section. [p. 73] / cyma recta (Latin, cyma, wave). Important compound moulding, combining the ovolo and cavetto with the convex moulding below. In section the moulding is a double curve, concave above, convex below. Also known as ogee moulding. cyma reversa... [presenting concave below, convex above, p. 97]{{cite book}}: CS1 maint: multiple names: authors list (link)

[2] The ogees are the nonlinear parts of the profile, only; the shaded area represents the side of the molding facing the wall of the building's room that is being decorated.

[DaviesJokiniemi2011-3] Davies, Nikolas; Jokiniemi, Erkki (2011). Architect's Illustrated Pocket Dictionary. Oxford, England: Architectural Press. p. 318. ISBN 9780080965376.

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