Title page of the detective story "A Spool of Wire Speaks" in the Technical World Magazine, December 1906

Here, the possibility of being able to record telephone conversations with the telegraphone was promoted. This was not possible with a mechanical phonograph. The objective was to expose fraudsters or unfair business partners. The advantage of the wire recording devices was their long recording time of half an hour. Phonographers could record only 4 minutes. The telegraphone could therefore also record longer conversations.