Light Beams Guide Blind Thru Building Without Escort (Jul, 1934)
Light Beams Guide Blind Thru Building Without Escort
BEAMS of light now guide the sightless through building corridors and up and down stairways. The subject is equipped with a portable photronic cell unit which sounds a buzzer as long as the operator travels along the light beam. The buzzing ceases when the course is changed.
At points where two or more light beams intersect various combinations of sanded strips are glued to the floor to indicate locations of doors, stairways or corners.