CLASSICAL WINDOW FORMS
Post 318 ⇒ by Gautam Shah →
Architectural history is full of different forms of windows. Of these three forms have matured over the ages to reach level of classical antiquity. These are Palladian window (16th to 18th C), Rose window (17th to 19th C) and Colonial Georgian sash window (1720 to 1830). All three windows have different size, shape, form, purpose, placement and related architectural styles.
Palladian opening is a three-part window. The central circular arched gap is supported by columns, which are offset from the wall thus creating two smaller width gaps on sides. Smaller side openings are flat headed. The window form is also called Serliana or Serlian motif from its originator Sebastiano Serlio (1475–1554) an Italian Mannerist architect, theorist and painter, who published a treatise as Serlio’s L’Architettura (1537–75) to introduce the principles of ancient Roman architecture into France. The triple window form was refined and used by architect Andrea Palladio in the Venice region. So, it is also known as the Venetian window.
A Palladian window is a classical, well proportioned and symmetrical architectural entity that is used as a window as well as a motif. A Palladian motif is placed as a decoration, window, door-window combination and simply as gap in an exterior passage or as part of a colonnade, such as in Basilica Vicenza, Italy. Palladian motifs were placed on the ground floor as entrance to portico, but in later period began to be placed over the entrance doors, on upper floors as the focus element of the building’s facade. Palladio used the motif in many creative ways. For Palazzo della Ragione, he created depth by using double columns and wider barrel arch shell.
The Palladian form on an upper floor is characteristic of the Federal style, but has also been used on other buildings from Victorian to modern times. Architect Philip Johnson used it as a doorway (for University of Houston College of Architecture building in 1985, and also at the Museum of Television and Radio building in 1991, New York City). He said ‘I think Palladian windows have a prettier shape. I wasn’t trying to make any more important point than that’.
Rose window is a circular window usually found in Gothic period churches. It is divided into segments by stone mullions and tracery. Rose windows are also called Catherine windows after Saint Catherine of Alexandria who was sentenced to be executed on a spiked wheel. Rose Window is fairly complex and evolved design, whereas its simpler and earlier version of Medieval period was called a wheel window, as it was divided by linear elements like spokes, radiating from a central solid boss. Circular windows called eye or ocular window or Oculus, in ceilings and high up in walls have been use since Roman times. Smaller circular openings also were placed over door and window openings.
Rose windows are mainly placed on the West front of the church building and over the entrance door. Most common subject of the stained glass is the Christ seating in the centre and within the lights around him are placed four Gospel writers, Apostles, Prophets, Saints and Angels. Some windows show God’s dominion over skies by including heavenly bodies such as the zodiacal signs and Labours of the Months.
San Pedro, Ávila, Spain.
COLONIAL GEORGIAN SASH WINDOWS
Georgian Architecture was widely used in the English colonies of the time. In the American colonies, colonial Georgian blended with the neo-Palladian style to become known as Federal style architecture. American Georgian houses typically have well-organised facade with five windows on the first floor and four windows plus a central colonnaded entrance door on the ground floor. The Georgian window is a double-hung sash window. Early in the 18th C, a classic style Georgian window was made of two sashes, each with 3 x 2 =6 glass panes. This remained in use even after the advent of larger glass panes in the 19th C. These sash windows, placed almost flush with the outer face of the walls, were painted white. The white colour over glazing bars also reduced their presence against the glass, making the window look more elegant. The preference for white colour sash windows has continued till today even though materials have changed from wood to plastics, steel and aluminium.
Vertically sliding window or sash windows are favoured for the ease of opening and controlled ventilation. Sash windows are less susceptible to warping due to moisture, as the shutter is bounded by a frame. Sash windows open by remaining within their frames, so do not distract, as do the hanging shutters of the casement windows. A Georgian sash window remained very widely used form till the use of steel casement windows as a cheaper and functionally superior option became acceptable.