In
architecture
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and construction, constructi ...
, a transom is a transverse horizontal structural beam or bar, or a crosspiece separating a door from a window above it. This contrasts with a
mullion, a vertical structural member.
Transom or transom window is also the customary
U.S.
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 states and a federal capital district, Washington, D.C. The 48 contiguous ...
word used for a transom light, the window over this crosspiece.
In
Britain
Britain most often refers to:
* Great Britain, a large island comprising the countries of England, Scotland and Wales
* The United Kingdom of Great Britain and Northern Ireland, a sovereign state in Europe comprising Great Britain and the north-eas ...
, the transom light is usually referred to as a
fanlight
A fanlight is a form of lunette window (transom window), often semicircular or semi-elliptical in shape, with glazing (window), glazing bars or tracery sets radiating out like an open Hand fan, fan. It is placed over another window or a doorway, ...
, often with a semi-circular shape, especially when the window is segmented like the slats of a folding
hand fan
A handheld fan, or simply hand fan, is a broad, flat surface that is waved back and forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a Circular sector, sector of a circle and made of a thi ...
. A prominent example of this is at the main entrance of
10 Downing Street
10 Downing Street in London is the official residence and office of the Prime Minister of the United Kingdom, prime minister of the United Kingdom. Colloquially known as Number 10, the building is located in Downing Street, off Whitehall in th ...
, the official residence of the
Prime Minister of the United Kingdom
The prime minister of the United Kingdom is the head of government of the United Kingdom. The prime minister Advice (constitutional law), advises the Monarchy of the United Kingdom, sovereign on the exercise of much of the Royal prerogative ...
.
History
In
early Gothic