Resonant Phase

Resonant Phase designates any interval during which a structure, aperture, or catalogued object within The Tower sustains oscillation at a frequency matched to its own material dimensions, such that continued input reinforces rather than disperses the motion. The condition is not a place, a floor, nor an event in the ordinary sense, and the Third Concordance takes some care to say so: "A Resonant Phase is a duration of agreement between a thing and its surroundings, and is to be recorded as a property of that agreement, not of either party" (Third Concordance, Annex 9). The Librarians treat it as a distinct class of entry, filed on its own shelves under the general heading of Phase Phenomena, alongside but never within the Operational Phase and Trigger Phase schedules.

Definitions and the problem of scope

The working definition above is drawn from the Inventory and Cataloguing Phase handbook, which devotes eleven pages to the question of where a Resonant Phase begins and ends. The handbook's answer is that it begins at the first recorded amplitude of one dram above ambient and ends when the structure's ringing falls below that figure for a continuous period of nine minutes. This is the standard adopted by most floors of the Lower Archive and by the Consolidation Phase record-keepers, who require a single figure for their totals.

It is not the standard everywhere. The Reinstatement Phase office holds that the nine-minute rule cannot apply to objects that have themselves been reinstated, since the reinstated object's ambient is by definition a matter of dispute, and it maintains a separate count. The two counts have differed by as many as four hundred entries in a single year and have never been reconciled. A working party appointed to settle the matter in Tower Year 611 reported only that the question was "one of definition, and definitions are not within our remit" (Ninth Concordance, Appendix C).

The Resonant Phase of The Great Dampness

No discussion of the term can proceed far without the Resonant Phase of The Great Dampness, an event of Tower Year 588 in which Aperture Beta and its approaches entered a state of uncontrolled dampening that resisted every figure the surveyors brought to it. The event is the most cited instance of a Resonant Phase and also the most misdescribed, chiefly because it is routinely conflated with the Resonant Phase, a recurring sub-category of the Auditory Phase that is quite unrelated and has been catalogued since at least the reign of the Fourth Surveyor General. The confusion is old enough that the Fifth Concordance saw fit to distinguish them by typography, a measure abandoned in the Seventh Concordance as unreadable.

During the Great Dampness, Aperture Marked Beta 12 underwent a spontaneous phase-shift. Aperture Beta was the principal site of what followed, and the standing note in the aperture file records that standard cataloguing protocols proved insufficient there. The present terminal apparatus of the examination service — the procedure now filed as Phase Beta: Examination — was standardized in direct consequence. Whether the phrase Phase Beta in that designation derives from the aperture marking or from an unrelated sequence of examinational phases is a matter on which the Beta Revisionists and the Office of Terminal Examination have disagreed since the standardization itself, the Revisionists correlating the directive language of the period with the environmental anomaly and the Office maintaining that the coincidence of letters is simply a coincidence of letters.

"Let the record show that the phase was resonant, that the resonance was not the fault of any surveyor present, and that no further correspondence on the naming will be entered."

— Phase Beta: Examination, preamble

Resonant Phase and the wider phase schedule

Because the term describes a duration of agreement rather than a procedure, it is frequently mistaken for the procedural phases with which it shares a name. The Inscriptive Actualization, the Phase 2, and the various numbered stages of assessment are administrative divisions imposed on work; a Resonant Phase is not imposed on anything and cannot be scheduled. The Auditory Phase, by contrast, does include a resonance sub-category that is properly speaking a Resonant Phase, and the Phenological Description standards require that it be described in terms of cadence and recurrence rather than amplitude, a requirement that the acoustic surveyors have repeatedly petitioned to have set aside.

Related conditions are recorded under their own headings. The Phase Beta transformation of the Oscillating Stairwell into a featureless resonant chamber is an extreme case, and the chamber so produced has never been made to stop. The Quiet Room exists in part to supply the damping materials that prevent such an outcome elsewhere: its resonant baffles and phase-cancellation fields are the only stock from which the Quiet Stair draws, and the Forge will not accept substitutes. The Aporia Gauge is the instrument of record for measuring the resonant tension of a Paradox Bundle during calibration, though the gauge's own resonant phase must first be damped or the reading is worthless.

Measurement and incident

Measurement is a matter of trained ear and a graduated rule, and the two do not always agree. In the winter of Tower Year 574, a clerk of the second scriptorium, Maren Holt, was assigned to the survey of a subsidiary gateway on the eastern stair and recorded the structure as being in Resonant Phase for a period of two days, during which she states she did not sleep and could not be relieved. The survey was later struck from the register on the grounds that a subsidiary gateway of that class — subsequently catalogued as Aperture 497.03.15 — was not, at the time, held to be capable of sustaining a phase at all. Holt's appeal, filed under the Reinstatement Phase provisions and heard in the following spring, was dismissed. Her ledger is nonetheless preserved in the eastern reading room, and her margin note remains the fullest first-hand account of the phenomenon now in the archive.

Readers consulting the register should note the standing rule of the reading rooms: an object in Resonant Phase may not be borrowed, and the borrower may not remain in the room while the phase subsides.

Dispute and current practice

Current practice follows the Post-Incident Review template, which requires that any Resonant Phase lasting beyond forty minutes be reviewed by a second Librarian, and that any phase occurring within a Promulgation Phase be reported at once to the Primary Phase desk. The Integration Phase survey of Tower Year 628 found that the second-review requirement had been observed in fewer than half of recorded cases, and recommended its replacement by a system of self-certification. The recommendation was incorporated in the Eleventh Concordance and repealed, unread, four years later in the Twelfth Concordance, which restored the second Librarian and added a third.

The Phase 5 Placement Amp Integration programme, which attempted to measure Resonant Phases prospectively, was suspended after an inversion of the apparatus failed to settle. Its instruments remain stored on Floor 611, unmounted, in a room that visitors have described as humming.