Spinning disks scanned mourners left behind by the dead, changing their pictures to sounds, which were transmitted through telephone wires.
The waveform of the dead, a strange sound (rather than pretty music), and indeed image of someone's thought.
Ella and Jacob's Experiments:
The pair settles on Jacob's farm, where Ella begins her inventing work in earnest. Inspired by her brother's researches, Ella's interests now focus on the dead, who she hopes to bring into our world through a visual telephone. She begins to make working models of potential mechanisms. Meanwhile, hjer new husband Zoltan Abbassid conducts his own secretive experiments on the Mesopotamia bees he has sold to Hive-Maker.