Carpenters' Hall


Ocular Window, Keystone


1. ocular window (red)
A rounded English-style window.

2. keystone (blue)
The central block (vousoir) of an arch. Until the keystone is in place, the arch will not support itself.

Keystones, like this one, are often used for ornamentation instead of its original purpose of supporting an arch. There are other ornamental keystones in Carpenters' Hall, like the ones in the moulding over some of the other windows and doorways.

This ocular window can be found on the rear facade of Carpenters' Hall.

Carpenters' Hall, 320 Chestnut Street, Philadelphia, PA 19106
Open free to the public daily, except Mondays (and Tuesdays in Jan. and Feb.), from 10am-4pm

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Copyright 1999-2015 by the Independence Hall Association,
a nonprofit organization in Philadelphia, Pennsylvania, founded in 1942.
Publishing electronically as On the Internet since July 4, 1995.