Two Danish civil engineers M. Axel Petersen and M. Arnold Poulsen have demonstrated before an audience of prominent persons, a new invention by which human voice is photographed by a special method on a separate film, which is not connected with the picture film. The device is invented by Prof. P. O. Pedersen, Director of the Polytechnic High School, Copenhagen and M. Valdemar Poulsen, a pioneer of wireless technology. The invention will be demonstrated in England and America in the near future.