centre-opening

Updated: July 16, 2025

This cupola is entirely composed of deal boards, a foot in breadth, an inch in thickness, and about four feet in length. It is divided into twenty-five lateral openings, which give as many rays of light diverging from the centre-opening, whose diameter is twenty-four feet. These openings are all glazed, and the wood-work of the dome is covered with sheets of tinned copper.

Francis W. Blagdon - Paris as It Was and as It Is