“RADIO NEWSPAPER”

Evening Star, Issue 23699, 5 October 1940, Page 4

“RADIO NEWSPAPER”

PRINTING BY HEAT

PAPER CHANGES COLOUR

’ Heat generated inside invisibly-inked paper by ultia-ingn irequency electric oscillations is tne proposal made lor “ printing ” newspapers and photo- ' graphs by radio in a recent patent. : The heat-recording facsimile system is ’ :said to give finer detail than those ' which use ink or carbon paper to re- • produce the radio-send images. Since • 'there is no-contact between the printing stylus and paper, it is claimed that wear is reduced to a minimum. In operation, the system picks up ' the radio signals whicii correspond to • the print on the paper that is being scanned and transmitted at the broadcasting station. High frequency electric currents are generated, and these are modulated by the received radio signals. The modulated high frequency signals lead to a stylus and also to a rotating drum. On the drum is wrapped pyro paper, which changes colour when heated. The stylus does not establish contact with the paper, but as the high-fre-quency currents zip back and forward through the space between it and the drum a pin-point of heat is generated in the paper. The paper changes to the same colour as the corresponding point on the print or the picture being broadcast. As the drum rotates and the stylus moves over it, the whole paper is “ printed ” by points of modulated heat.