In about 1936 and 1937, German broadcasters developed a peak programme meter which used a mirror galvanometer known as a'lichtzeiger' (light pointer) for the display.
German broadcasters developed a peak programme meter. This was in about 1936 and 1937. This peak programme meter used a mirror galvanometer. This mirror galvanometer was known as a'lichtzeiger' (light pointer) for the display.