The valve that allows one aethographor to communicate with another. The prototype of this valve was a highly sought after item in Etiquette & Espionage. Later, Sophronia learns that it can also be used to issue commands to mechanicals from afar, when the Picklemen use them to gain control of large groups of mechanicals across the British countryside.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.