The Telegraphone.

Progress, Volume II, Issue 7, 1 May 1907, Page 263

The Telegraphone.

Speaking recently of this instrument, the famous electrician, Sir William Preece, ex-president of the Institute of Civil Engineers, said that " It is one of those things which is going to open the eyes of all our physicists and scientists and theoretical men on the question of the molecular character of all magnetic and electrical apparatus operations " The fundamental principle of the machine is essentially dependent upon magnetic changes set

up in a steel recording-medium, when acted upon by sound vibrations, during its passage through a magnetic field. The actual record, being magnetically induced, is, of course, invisible. Nothing whatever is impressed upon the recording medium, the record being obtained by an inscrutable rearrangement of the molecules throughout that portion of the recording-medium operated upon at any given moment. In much the same way that a piece of iron may be rendered permanently magnetic, or may be demagnetised so records taken on the telegraphone can either be secured in a permanent form, or can be obliterated at will.