Prism Glare Shield Reduces Night Driving Hazards (Feb, 1932)
Prism Glare Shield Reduces Night Driving Hazards
CONSISTING of two finely polished optical glass prisms set in a metal mounting, this device is designed to serve as a glare eliminator for automobiles. Fastened over the windshield, it is perfectly transparent so that the driver can clearly see the road. Startling as it may seem, however, on the approach of another car with glaring headlights the device immediately lowers an “optical curtain” so that the oncoming car and lights vanish and the driver can see as clearly as ever.
Optically the device consists of two accurately ground and highly polished prisms, which are mounted with a minute air film intermediate of the two prisms. When driving at night the brilliant light of an approaching car strikes the eliminator and the dazzling rays are immediately refracted by the prisms, causing a dense, shadowy curtain to drop and shield the eyes.