TELEPHONES WITH MIRRORS.

Rodney and Otamatea Times, Waitemata and Kaipara Gazette, 12 June 1912, Page 7

TELEPHONES WITH MIRRORS.

Professor Rosing, of the Technological -Institute of St. Petersburg, is perfecting an instrument by which the telephoner will be enabled to see the telephonee. Metallic cells or elements that vary the strength of an electric current under variations of light intensity are being improved in senitiveness, and with a simplified receiving apparatus a pencil of light is made to trace rapidly on a screen a picture of any image that may be facing the transmitter. Two sets of compound mirrors move so as to project this image upon the light sensitive element in successive small portions. The varying electric current excites invisible rays by a special vacuum tube of the receiver, and as these rays pass in a point over-a fluorescent screen, following the movementls of the transmitter mirrors, the varying glow reproduces the light and shade of the original image. The movement of the mirrors also controls, through a series of electric currents, the movements of the rays over the screen, a complete cycle of transmissions takes but an instant, and rapid repetitions give a continuous picture.