Glass Substitutes for Home Sun-baths
If one must take sun-baths indoors and cannot take them through open windows as has been suggested, one should secure a glass that is permeable to the actinic rays. The pres¬ent disadvantage of such a form of improved glass is that it is expensive .But even so, it would not cost a great deal for Home to equip one or two windows with it. However, some glass- substitutes are very inexpensive and almost as good. In fact they even have a certain advantage over the glass in that they are not transparent. They let in the light, but cannot be seen through; hence they insure complete privacy. A sun-porch, or a portion of it, may be provided with such a glass-substitute; or a window-frame might be fitted with it, to be slipped into the window and secured by means of cleats or slight tacking, after the window has been opened as widely as possible. A still further advantage of the glass-substitute, especially one with wire mesh coated with a semi-transparent substance, is that it lets in more heat than either ordinary glass or the sj^ecial glass; yet it is very tough and resistant to even severe rain and hailstorms. The glass and glass-substitutes that permit the ultra-violet rays to pass through them are procurable through builders, lumber-dealers, and dealers in glass and hardware.