The aerator box

The aerator box is a crank-operated device made by William Keeble and identified by Langdon St. Ives as his aerator. It releases green vapor, but its significance extends beyond that demonstrable use: amid a cluster of nearly identical boxes, it becomes easy to confuse, covet, and interpret as something more than a machine. Its public use by Shiloh turns it into an instrument of spectacle, while its later recovery by Theophilus Godall places it again within the dangerous contest over the boxes and their contents.

Identity and Construction

The aerator belongs to a family of Keeble boxes whose similar forms make recognition uncertain. Sebastian Owlesby had persuaded William Keeble to build a box for a great emerald, the inheritance intended for his son, Jack Owlesby. That container was almost identical to the lead-lined cube holding the Homunculus. The resemblance matters: the boxes are distinct in purpose and contents, but their likeness allows one to be mistaken for another and makes possession an unreliable guide to what a box contains.

The aerator’s operation is more directly observable than the identity of some of the other boxes. In a public scene, an old man turns its crank and releases a cloud of green vapor; later, he cranks it again and directs the emitted vapor over the crowd. The evidence does not establish a technical explanation for the vapor or show that the machine itself can animate the dead. When Joanna Southcote’s skull is displayed in a glass case, its teeth appear to move, but the account leaves open whether this is animation or the attendant shaking the case. The box’s effects therefore remain theatrically potent without being scientifically resolved.

Confusion Among the Boxes

The object’s history is entangled with an uncertainty about which box has gone where. After waking from profound exhaustion, William Keeble confirms that the emerald box and the Homunculus box are identical apart from differences in carving and paint. Nell Owlesby admits that, in her agitated state, she might have mixed them up, and allows that Dr. Birdlip might have the emerald. Her question about whether the little man could speak makes the confusion more than a matter of valuable property: a mistaken transfer might also change who is responsible for the Homunculus and what others believe it to be.

Other episodes underline how readily boxes acquire new meanings through their contents and handlers. A man who extracts a hidden box hears a tiny, distant voice and fears that it speaks from inside his own head; the passage presents his alarm, but does not establish that this is the aerator. Captain Powers later discovers that the emerald box has disappeared from a chest. These incidents belong to the wider box-and-emerald plot, not proof that the aerator contains the voice or the jewel. Keeping those objects distinct is essential: near-identical construction generates confusion, while the narrative repeatedly makes the contents decisive.

Use as Public Spectacle

Shiloh uses the aerator as part of a religious performance before a tightly packed crowd. He turns its crank and bathes his face in the vapor, drawing exclamations from onlookers. The box thus becomes a prop through which he presents an apparent marvel, although the scene does not confirm any supernatural power in the machine. When he produces the glass case containing Joanna Southcote’s skull, the audience sees a slight movement in its teeth, but cannot determine its cause. The uncertain effect suits the performance: the apparatus supplies visible action, while belief and expectation do the rest.

The vapor also becomes part of Shiloh’s own performance. He puts the tube into his mouth to receive what he calls the holy gases, then continues cranking and sprays the crowd as his voice shifts from a piping delivery to a creaking shout. The sequence shows the device serving both the spectacle and its impresario: it helps sustain the crowd’s attention, while Shiloh’s handling of it reinforces his claim to command the scene. Its mechanical operation is plain; the religious meaning imposed on it is not inherent in the box.

Recovery and Significance

Hasbro identifies the aerator as the box Willis Pule possessed when he jumped from the train. He also distinguishes it from the two boxes at Kelso Drake’s: one associated with the Homunculus and the other with The clockwork alligator. This inventory clarifies that the aerator is one object among several competing devices, rather than a catch-all name for every box in circulation. Later, Theophilus Godall is seen holding Langdon St. Ives’s aerator while restraining Pule on Hampstead Heath. The object has passed from a theatrical use back into the hands of St. Ives’s allies, while Pule’s capture marks the immediate end of his control over it.

The box’s final appearance preserves rather than dispels the unease surrounding these objects. Parsons glances at the aerator in St. Ives’s arm and begins to raise a concern about a figure’s eyes, then asks whether St. Ives intends to open it there. The brief exchange connects the device to the possibility of a presence within a box, but does not specify what Parsons has seen or establish that the aerator holds the Homunculus. Elsewhere, Captain Powers displays an open Keeble box containing the great emerald, confirming that the jewel’s container and the aerator remain distinguishable even when their similar construction has encouraged mistakes.

The aerator’s narrative force comes from this tension between clear operation and uncertain significance. It can be cranked, its vapor can be seen, and its custody can be tracked; what the vapor proves, and which box contains what, are less secure. In Shiloh’s hands, a device becomes evidence for a religious spectacle; in the wider struggle, its resemblance to other boxes makes it part of an unstable chain of identification and possession. The machine does not settle the novel’s mysteries. Instead, it gives them a portable, material form.