Intermembrane Bleed Graded Against the Boundary Types

About 2819 UCSD the Survey Corps gets the Etheric half of the boundary picture into the same diagram as the physical half. The Common Manifold had given the analysts the geometry of drift: strain distributed in one band, timing disagreement absorbed in another, which is why two chronometers at a boundary post can each be right and still disagree. The Corps now extends the same structure one band higher and names the coupling it had spent decades filing as Etheric interference: Intermembrane Bleed, one universe's archetypal templates reaching a neighbour's across a narrowed Interval, graded against the Boundary Types already in use. At Type II the signature is Membrane Resonance, detectable and non-displacing. At Type III it is Intermembrane Bleed, neighbouring templates competing for local admissibility.

The renaming is not cosmetic. Etheric interference described a symptom; the new term names what produces it, and gives an analyst something a chronometer discrepancy can be diagnosed against. It also fixes what kind of boundary a boundary post sits on. A bleed signature is available only between membranes, and there is no Interval inside a universe, so every boundary zone on the Survey Corps' books is the inter-membrane kind: what registers across one is a neighbouring universe, read through a gap nothing crosses. Older filings that speak of the edge of two Concordants are read from here as the loose usage of their period.

The grading came too late for one post to use it at once. Threshold Station had carried its forty seconds as a hardware fault since 2815 UCSD and held no certified analyst to read them otherwise; they were read as a Type II boundary reading in 2826 UCSD.

Canon facts:

• Intermembrane Bleed and Membrane Resonance are Survey Corps terms graded against the Boundary Types (Type I undetectable, Type II Membrane Resonance, Type III Intermembrane Bleed); they name an Etheric-channel coupling, where Etheric interference named a symptom.
• The grading postdates the Boundary Monitoring Protocol of 2811 UCSD, which speaks only of Etheric-layer assessment, and precedes the Gravimetry Desk's working paper of 2825 UCSD, which already treats the Interval and the far side's mass as settled vocabulary; the year between is the record's, and approximate.
• Under the grading, every boundary zone on the Survey Corps' books is an inter-membrane boundary: a narrowing of the Interval between two universes, never an edge between two Concordant Zones of one.
• The grading conferred no remedy. A membrane-proximity event does not resolve by recalibrating instruments on one side of it, and Etheric-layer certification exists to read Membrane Resonance before it develops into Bleed, not to prevent either.

See: Concordant Membranes and Intermembrane Bleed, Intermembrane Bleed, Boundary Zones and Concordant Edges, The Common Manifold, Membrane Shadows, Weighing the Neighbours, Boundary Readings Classified as Etheric Interference.