Double Hung Window

Sash Windows

A Double Hung Window consists of two sashes or movable panels operating in a rectangular frame which, when both are closed, are positioned one immediately above the other. These panels can be vertically slid up and down in tracks, but are kept from dropping to the sill by counterweights attached by cords or chains, springs or balances and concealed in the window casing.

WIKIPEDIA ENTRY FOR WINDOW.

Double Hung Window Picture Double Hung Window 2 Picture