1948. The oiled-paper frame consists of a light frame of timber, with cross bars mortised into the sides, and intersected by packthread, forming meshes about nine inches square. Common printing paper is then pasted on; and, when quite dry, it is painted over with boiled linseed oil. These frames are then fitted to the wall, or subject of protection, according to circumstances. Cow-hair netting is sometimes used instead of packthread, and calico or muslin covered with Whitney's composition is substituted for oiled paper.