For our windows we made wooden sashes which fitted nicely into the window openings. A small hole was drilled through the sash at each side into the frame, and nails inserted in these holes held the sash in place, and served also as hinge pins for the sash to turn on. The sash could be taken out at any time by removing these nails. As we could not afford to use glass for our windows, we covered the sashes first with cloth, and later, when it occurred to us that in winter time it would be difficult to keep the cold air out, we used oiled paper.