Operable transom
Operable transom
A pane of glass above a door, which may be opened for ventilation.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
operable transom
A panel or glass light, above a door, which may be opened for ventilation.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.