Clam’s Shell Gives Health Rays (May, 1931)
Clam’s Shell Gives Health Rays
PANELLING made from the tough, translucent shell of a large Philippine clam is now being used as a filter for sun rays, and is said to transmit all of the healthful ultra-violet and infra-red rays.
The material is light in weight and non-shatterable, and is claimed by the manufacturer, who makes it in any size, to be five times as strong as ordinary window glass. It is opaque, making a private sun bath possible anywhere the sun’s rays are available. The new material is especially suitable for construction of sun porches and greenhouses.