In some brands the frame lining and sash lining are of metal. In some only the frame is metal lined. In some the frame is corrugated and the window sash slides up and down easily as the protuberance slides into the depression in the unlined sash furrow. In another brand two metal tubular strips are used, the metal protuberance fitted into a metal lined depression. Here the window slides easily and no amount of warping can disturb the nice adjustment. In such weather strips are created conditions which absolutely prevent the side action of windows, so hard to cure with carpentry or cheap types of weather strips. The lower sash is managed as is the upper, only the strips are reversed. OTHER CASES The casement window has its peculiarities of treatment, as have doors and windows which open in the center. In the casement which opens in, for example, a brass triangle is provided with “weep holes” to drain out any water which may accumulate on the sill and follow through into the room. The meeting rail is sealed in a way approximately as in the sliding window. The sill strip is peculiarly shaped to spring into its sealing power; sometimes it is called a Z-shaped plate, each manufacturer having his own name and pet plan. DOORS The door sills are made with metal, and metal strips forming a sealed joint against warping, settling air, etc. There is a very nice device used to prevent the cold air let into the bedroom at night from escaping into the halls and cooling them off. On the lower edge of the door is fitted a spring which when the door is closed by contact with the hinged side of the frame releases a felted pad which fits tightly against the sill of the door. This makes one’s winter immersions a pleasure, for the bathroom, if you have one connecting with your room, as well as the hall will be warm for your morning use. APPLICATION Weather strips can be applied after as well as when the house is built. “My house is so well built,” said a friend of mine, “that it does not need weather stripping.” If that could have been so, it was a unique house. There is hardly a house where the wood around the doors and the windows does not warp or shrink or do something equally obnoxious. Whether seasoned by long processes of actual weathering or rapidly kiln dried, wood in captivity becomes restless, and seems to strain and struggle in its fury. Nothing can be said against the builder--it is the nature of wood. The builder is always glad to install the strips because then the owner does not get a chance to feel antagonistic on account of recalcitrant windows, difficult heating, etc., and is therefore relieved from grumbling.