A-18

A-18 is the designation assigned to a stairwell, and to the body of regulation governing its use, situated between the landings of Floor 412 (Fifth Recension) and Floor 413 (Unnamed Pending Review). It is the lowest-numbered aperture-class designation in the A-series not attached to a chamber, a recorder, or a person, and the only one whose principal text has been amended without ever having been read aloud in full. The stairwell descends eleven steps, turns, and descends nine more; the twenty-first step is absent and has been absent since at least the Second Recension of the Stairwell Register, though no gap is visible to the eye.

A-18 is administered jointly by the Custodial Office of Actualizations and the Bureau of Registry, an arrangement that has never been described as satisfactory by either.

Designation and physical description

The stairwell is 1.42 metres wide at the top landing and 1.39 at the bottom, a discrepancy first recorded by Landing Surveyor Marn Ospeth in the winter of 1106 and confirmed by her successor in 1107 after the surveyor's notebook was mislaid for a season. The walls are dressed stone to the ninth step and undressed below it. Handrail present from step two to step seventeen; absent thereafter, with the bracket holes intact. The lighting is administered under Concordance 47, Annex 6, which permits two lamps and requires that neither be fitted with a chimney.

Floor 412 is an ordinary floor and may be traversed freely. Floor 413 is not, and A-18 is the only approach to it. This asymmetry is the source of nearly all subsequent difficulty.

The missing step and the Ospeth Finding

Descending A-18, the nineteenth and twentieth steps are separated by a drop of 0.31 metres, which is roughly one and a half risers. Travellers report the drop without reporting a fall, and pendulums suspended over the gap swing for a period consistent with a step being present. In 1107 Ospeth entered the finding that "the twenty-first step is load-bearing and not traversable" (Landing Survey, Second Series, fol. 44), a formulation the Bureau of Registry accepted without alteration and the Custodial Office of Actualizations has disputed annually since.

The Custodial Office holds that a step which bears weight is, by definition, traversable, and that A-18 must therefore be closed pending physical investigation. The Registry holds that Ospeth's finding describes the step's condition and not its availability, and that closure would require the stairwell to first be entered, which the finding discourages. No investigator has been dispatched. The dispute is renewed each year by docket and each year adjourned.

Concordance dispute

Concordance 47 governs sound at A-18 and does so in terms that cannot be reconciled. Annex 6 requires that no audible counting occur within the stairwell. Annex 9 requires that every descent be counted aloud by a second party standing at the top landing. The Amendment Logging Office records both annexes as current and has declined three petitions to say which prevails.

"Where two annexes bind a single passage, the elder shall yield. The elder is not, for the purposes of this clause, the earlier."

— Concordance 61, cl. 3

Since neither annex can be shown to be earlier — the dating of both was established by the same clerk on the same afternoon and the marginal note is water-damaged — the clause has not resolved the matter. In practice descents are counted in a whisper, which satisfies nobody and which the Acoustic Reconciliation Bureau has twice declined to classify.

Incident of 1141

On the eleventh of Ferril, 1141, a junior clerk of the Bureau of Registry, identified in the docket only as the Third Intent Declaration Bearer, descended A-18 carrying a sealed intent declaration for Floor 413. At the twentieth step she stopped, and was heard by the counting party above to say that she could see the landing. The counting party reached eleven, which is the count they had reached on the previous six descents at that hour.

What followed is recorded in Final Logging as an unresolved descent; in Amendment Logging as no event; and in the Primary Logging register as a completed transit. The clerk was recovered on Floor 412 forty minutes later, still carrying the declaration, which she reported as delivered. Floor 413 received no entry that year. The docket was closed under Concordance 22 and remains cited in custody disputes as the plainest example of a floor declining to accept what has been brought to it.

Access, prohibition, and the annual reclassification

A-18 may be entered by any Librarian in good standing with a hand-lamp and a named counting party of no fewer than one. Minor clerks may descend to the seventeenth step only. Baskets, crates, and other carried goods are not permitted below step nine, nor is the handrail to be used as a seat; both prohibitions derive from the same incident and neither has been explained in writing.

Each year the Bureau of Auditory Logging submits A-18 for reclassification as a logging site rather than a passage, on the ground that more counting occurs there than in most of its chambers. The Custodial Office of Actualizations opposes on the ground that reclassification would give the stairwell a name. The Registry has ruled four times that reclassification is a matter for the Registry, which has not yet ruled on the merits. Floor 413 remains awaiting review, and A-18 remains the shortest and most heavily governed distance in the Tower.