Ogee

Source: Wikipedia, the free encyclopedia.
For the cartoon character named "Ogee", see Magilla Gorilla.
Not to be confused with Ogive.
Two ogee curve examples with their extended S-shape, concave over convex (cyma recta), and convex over concave (cyma reversa), representing the cross-sections of two types of decorative moldings used in building[1][2]

An ogee (

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
]

An ogee arch, showing the pair of component blocks on each side that constitute the "double curve" of the ogee, joined at its peak by a capstone.[1]: 218  The midpoint of the two blocks on each side that compose the ogee, the point at which the overall curve changes direction, is the inflection point referred to in the lead.

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

millwork trades associated with building construction, ogee is still sometimes written similarly (e.g., as O.G.).[citation needed
]

Use in architecture

Look up ogee in Wiktionary, the free dictionary.

Ogee arch

Gothic Revival architectural styles.[1]: 218 .Ogee arches were also a feature of English Gothic architecture in the later thirteenth century.[6]

Moulding

A building's surface detailing, inside and outside, often includes

cyma reversa and talon.[7]

An unorthodox ogee arch in Kilfane Church, Ireland (13th century)

The ogee curve is an analogue of a "

Tomb of Cyrus featured the cyma reversa.[8] The cyma reversa is also evident in ancient Greek architecture, and takes its name from the cymatium.[9][page needed] The ogee and Roman ogee profiles are used in decorative moulding, often framed between mouldings with a square section.[citation needed] As such, it is part of the standard classical decorative vocabulary, adopted from architrave and cornice mouldings of the Ionic order and Corinthian order.[citation needed
]

Ogees are also often used in building interiors, in

case furniture.[citation needed
]

Other uses

Ogee clock, framed with ogee moulding.

Ogee is also a mathematical term, meaning an inflection point.[citation needed] In fluid mechanics, the term is used to refer to aerodynamic profiles that bear such shapes, e.g., as in the ogee profile of the Concorde supersonic aircraft.[citation needed] As well, ogee curves are used to minimize water pressure on the downstream face of a dam spillway.[citation needed]

In aesthetic facial surgery, the term is used to describe the malar or cheekbone prominence transitioning into the mid-cheek hollow.[

facelift surgery.[citation needed
]

Manufactured objects with the ogee description

Ogee is the name given to bubble-shaped chambers of

distillate to expand, condense, and fall back into the still pot.[10]

"Ogee washers" are heavy washers used in fasteners that have a large load-bearing surface; they are used in marine timber construction to prevent bolt heads or nuts from sinking into the face of timbers.[citation needed] The term ogee is used to describe the ogee shape giving rise to radial symmetry around the centre of the washer.[citation needed] Due to the size and shape of such washers, they are generally manufactured as a cast iron product (in accordance with ASTM A47 or A48).[citation needed]

"Ogee clocks" were a common type of weight-driven 19th-century pendulum clock presented in a simplified Gothic style, with the original design attributed to Chauncey Jerome.[11] Ogee clocks were typically made in the United States, as mantelpieces or to mount to a wall bracket,[citation needed] and are one of the most commonly encountered varieties of American antique clocks.[citation needed] The overall design was rectangular, with framing by moulding with an ogee-profile surrounding a central glass door with a painted scene below the clock face, a door that protected the clock face and pendulum.[citation needed] Weights supported by pulleys fell inside the ogee moulding and so were hidden from view.[citation needed]

See also

References

  1. ^
    ISBN 0-394-50931-5. Retrieved January 9, 2020. ogee. Combination of a concave and convex line, 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. linear
    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.
  3. ^
    ISBN 9780080965376
    .
  4. The Buildings of England. Harmondsworth: Penguin Books
    . p. 505.
  5. ^ "Geograph:: Effigy in the Recess © Bill Nicholls cc-by-sa/2.0".
  6. ISBN 9781856695848
  7. OCLC 719426
    . Cyma recta…which is hollow in the upper part, and round in the lower; and Cyma reversa, (Talon…) which is hollow in the lower part and round in the upper.
  8. ^ Hogan, C. Michael (2008) Tomb of Cyrus, The Megalithic Portal, ed. A.[page needed]
  9. ISBN 0-8196-0283-3.[page needed
    ]
  10. ISBN 978-1-315-15505-0
    .
  11. ISBN 978-0-930163-75-4.[page needed
    ]

Further reading

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