In early sash windows, the sash boxes were not checked into the side of the window opening, and were sometimes disguised as architraves. Early sashes, particularly when set into brickwork were usually fitted flush with the wall surfaces. They were quickly moved back into the building as early by-laws required them to be set back into the wall thickness to reduce the risk of the spread of flame.
A Yorkshire sash is where the sashes slide horizontally without the benefit of weights. Simplex hinges are hinges with grooves, fitted to the case, which allow the sash to be swung inwards for easy cleaning. The sash and case window was introduced into Britain in the 1670's from France. The early sash weights were quite often in lead, but cast iron soon became universal. Rather handily, cast iron weights, usually have their weight in pounds stamped on them.
Window frames, and sash and case windows in particular were never painted white.
This is a relatively modern trend. Darker traditional colours such as red or green emphasised the
reflective quality of the glass and made it more difficult to detect the presence of
suggested that the occupant could not afford the more desired larger sheets of glass.