Historic Window Details
While not common in this part of the country, the Dillon House was built with some very intricate and high quality window designs. As shown in the historic architectural book below, the windows at DH were built to create a weather seal when closed.
On the pair of out-swinging casement windows, one side of the meeting stile with the astragal has a concave (inward) circular pattern, and the other side of the window stile has a convex (outward) circular pattern that interconnect when closed, creating a near weather proof effect. VERY creative for 1911.
The windows utilize a unique meeting stile that incorporates the use of “astragals”.
An astragal is a molding profile composed of a half-round surface surrounded by two flat planes. An astragal is sometimes referred to as a miniature torus. It can be an architectural element used at the top or base of a column, but is also employed as a framing device on furniture and woodwork.
Carpentry – Book II, by William S. Lowndes, 1924
Hardware details of the historic windows show a very intricate mechanism for securing the window, top and bottom.
Close-up detail of the astragal curved window elements in Dillon House. The photo on the left is the astragal with the concave side, and the photo on the right is the window sash with the convex side.