Alexander Graham Bell's Cell Phone Sketches
At the time of these notebooks there was a tremendous amount of discovery and research around radio and radio waves. In many ways radio waves were to the late 19th century what semiconductors were to the late 20th century. In SELF PORTRAIT Bell shows a person speaking into a microphone which modulates a current in the loop of wire they are carrying. In CABLE GUY another person who is holding a loop of wire can "hear" the speaking at a distance because the newly discovered 'radio waves' had traveled between them.