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SCREENS 163
a screen, in the end, may be more efficient than any other because it can be recoated frequently, at low cost, presenting a fresh surface at all times.
Best Frame
The day of stretching screens and nailing them to a wooden frame is past. (63) Most commonly used today for mounting and stretching is a frame of wood or other material equipped with strong metallic hooks on all four sides which correspond with metal eyelets all around the screen edges. These eyelets should be no more than six inches apart. With the aid of a heavy cord a screen may he mounted quickly, stretched evenly and tightly and restretched as often as necessary.
(64) Properly prepared paint and kalsomine have excellent powers of reflection and diffusion.
Paint Surface
(65) If the screen body is of raw cloth it should be mounted on its frame and painted with one or two coats of glue sizing made by dissolving from one to two pounds of glue, according to its quality in a pail of hot water. It will be best to place the glue in hot water and let it set over night. In the morning heat and stir it until it is thoroughly dissolved. Then, with a brush. saturate the cloth thoroughly with it. If a second coat is to be applied, wait until the first has dried thoroughly.
If you are refinishing an old screen, sizing may not be necessary. If the glue fails to stick to the surface it may be necessary to size with shellac. Shellac may be purchased ready for use, but may need considerable thinning with wood alcohol. Brown shellac is just as good and much cheaper than the white.
After sizing the surface with glue, apply a fairly heavy coat of white lead, mixed with half boiled linseed oil and half turpentine, as a base coating. Let it dry thoroughly and then apply two coats of half white lead ground in oil and half white zinc ground in oil, mixed with one-fourth boiled linseed oil and three-fourths turpentine, into which .sufficient ultramarine or cobalt