Custodians of the Eighth Interval

The Custodians of the Eighth Interval were a body that apparently held temporal authority within the Tower, principally over the measurement and administration of the Silent Interval. They are recorded in the register of defunct offices, though no instrument of dissolution survives and no Librarian has ever certified their termination in writing. The Forty-Second Concordance, Clause 19, appears to grant them temporal authority outright, a grant that subsequent recensions have neither repealed nor honoured. Their best-attested instrument is the Lucid Bronze pendulum, against which the canonical duration of a Silent Interval was fixed at 4.7 seconds.

Origin and jurisdiction

The Custodians first appear in the record as a maintenance body attached to the Eighth Spiral, charged with keeping the interval between catalogue entries steady enough to be written down. That an interval requires custodianship at all was, at the time, uncontroversial; the term had been used loosely for a generation before anyone proposed it be fixed.

The fixing was theirs. Under the authority they read into Clause 19 of the Forty Eighth Concordance, the Custodians convened what their own minutes call the Settling of the Pendulum, at which the Lucid Bronze pendulum was swung in the presence of two witnesses and an auditor whose name the minutes give only as the Second Recorder. The figure of 4.7 seconds was entered into the ledger the same day. It has not been revised.

The pendulum and the standard

The pendulum is described in the Custodial inventory as "bronze, lucid, unhung" — a description that has troubled every scholar who has attempted to reconstruct the instrument, since a pendulum so described cannot swing. The Custodians themselves seem not to have noticed. Their maintenance schedule records that the pendulum was to be wiped on the first of each month and swung only by the Custodian holding the Interval Warrant. It was never to be brought below Floor 9007.

"The Interval shall be four and seven-tenths of one second, and no Custodian shall adjust it to accommodate a visitor."

— Custodians of the Eighth Interval, Interval Warrant, Clause 2

The plainness of the rule is deceptive. The Custodians spent the better part of a decade litigating what a visitor was. The Custodians of the Aperture maintained that anyone crossing a threshold was a visitor for the duration of the crossing; the Interval Custodians held that a crossing was itself an interval and therefore could not contain one. The dispute was referred to the Seventh and Eighth Concordances jointly and returned unresolved, with a note that the referring offices should "confer further."

Conflict with the Aperture and Closure

The Custodians of the Eighth Interval are best remembered for their long quarrel with the Custodians of Closure, who claimed that an interval could not be said to have ended until a closure had been recorded, and that the Custodians of the Eighth Interval had therefore been measuring not an interval but a pause. The Interval Custodians replied, in a memorandum of remarkable brevity, that a closure was merely an interval observed from the other side. Neither side produced evidence.

The matter might have remained scholarly had the Revised Eighth Concordance not assigned a maintenance obligation to the Eighth Spiral in Clause 4.1. The Interval Custodians read the clause as ratifying their custody; the Closure Custodians read it as transferring custody to whoever maintained the Spiral, and pointed out that the Interval Custodians had not maintained anything since the pendulum was last wiped. The Thirty-Eighth Concordance later cited and amended clauses of the Revised Eighth, but left 4.1 untouched, on the stated ground that "the floor is not presently in question."

Dissolution and disputes over it

The Custodians cease to appear in the record in the winter of the Year of the Ninth Librarian, the same winter in which the Eighth Librarian descended the Eighth Spiral. No entry marks their end. The Custodians of Static Artifacts took possession of the pendulum in a handover documented by a single receipt bearing no date, and it is from that receipt, rather than from any instrument of dissolution, that the office is conventionally reckoned defunct.

Not everyone concurs. The Ninety-Eighth Concordance has persistently disputed the jurisdiction of bodies operating under the Eighth Concordance, and has argued — in a submission now in its eleventh recension — that the Custodians of the Eighth Interval were never properly constituted and therefore cannot have been properly dissolved, a position that would leave the office in a state the Custodians of Coherence have described as "not vacant, which is worse." Appeals to the Custodians themselves have gone unanswered for the simple reason that the order does not answer appeals concerning bodies it considers beneath its notice.

Legacy and surviving claims

The 4.7-second interval survives its custodians and is now cited without attribution in most working documents, a fate the Custodians would likely have resented. Annex Γ of the Eighth Concordance continues to govern Floor 9007 on the assumption that an interval is being kept there, and the Eighth Concordance on Acoustic Integrity treats the 4.7-second standard as settled in a footnote that names no source at all.

The Custodians of Unwanted Thought hold a standing objection to the office's revival, on the ground that a restored Custodian of the Eighth Interval would be obliged to count the interval between unwelcome thoughts, and that no pendulum has been calibrated for it. The objection has not been heard. The pendulum remains in the keeping of the Static Artifacts, unhung, and is wiped on the first of each month by a clerk who has never been told why.