Also called an aethographic transmitter (although properly that is only one half of the machine, the other being an aethographic receiver). This is a wireless communication apparatus that does not suffer from electromagnetic disruption like the telegraph (which was abandoned as a failure). Two machines with matching valves (properly termed crystalline valve frequensors) can transmit messages through the aether to each other. The message transmitted is called an aetherogram. There are a little under 100 aethographers in the United Kingdom at the time of Changeless.
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