HOW THE BLIND CAN READ.

Pukekohe & Waiuku Times, Volume 9, Issue 589, 3 December 1920, Page 1 (Supplement)

HOW THE BLIND CAN READ.

Arrangements have been made w a British firm to manufacture Optophone, a wonderful instrum which enables the blind to read dinary type. This instrument, wb was recently perfected by the invc or, depends for its action on the culiar properties of selenium. T metal changes its electrical resista under the influence of light. In Optophone five minute beams of lij fall upon the printed letters and ■ reflected on to a selenium cell wb forms part of a telephone circl The blind operator sits with the t< phone receiver to his ear and mqf the line of type along. Each let according to its shape, alters the c rents in the telephone circuit U particular way, giving a change of sound. By this! means N blind can spell out the words. S