
A Chicago window is a large fixed glass panel flanked by two narrower sashes of the same height, filling a structural bay. The large pane is a single panel of plate glass, and the flanking elements are vertical
double-hung sash window
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air. Modern windows are usually glazed or covered in some other transparent or translucent ...
s with no dividing
muntins. The fenestration was first used by architect
William LeBaron Jenney in the 1884
Home Insurance Building, and immediately after by
Louis Sullivan at the 1899
Carson Pirie Scott department store, both in
Chicago, Illinois. The window design was made possible by advances in glass-making technology and steel structural framing, and became a defining feature of the
Chicago school style. The design offered both abundant natural light and practical ventilation.
Projecting
oriel bays are a common variant of the Chicago window.
References
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Windows
Chicago school (architecture)