Sentinels of the Silent Stair

The Sentinels of the Silent Stair are a custodial order charged with the maintenance of Enforced Silence along the stairwells catalogued under the Silent Stair designation, and in particular with the seven major stairwells — among them the Whispering Stair, the Quiet Stair, and the Stair of Silenced Bells — where worn tread and open masonry carry sound farther than the architecture intends. The order is one of the oldest bodies named in the Divan records and is distinguished from the wider Silent Sentinels by jurisdiction rather than by method: the Sentinels of the Silent Stair do not patrol floors, but gradients.

Their emblem, recorded without comment in the Fourth Inventory, is a bell suspended from a plumb-line.

Mandate and method

The Sentinels operate under the acoustic mandate set out in the Consensus Stair, which requires that no sound above a stated threshold be permitted to travel a full riser without attenuation. Enforcement is by silence-weights — graduated lead-and-felt discs hung on the handrail iron at intervals of either four or six treads, depending on the instrument consulted (see Disputed intervals below). A weight is judged correctly seated when a dropped pin at the nose of the tread above produces no audible impact at the landing below. Sentinel inspection reports record this test as a pin-fall, and a stairwell is described as sound when the pin-fall fails to carry.

Inspection is conducted in pairs, one ascending and one descending, who do not speak to one another and who communicate by tally-stick. Sentinel tallies are the principal source for the Register of Audible Incidents, the third volume of which has been closed to consultation since the Silent Shift Precedent.

Relationship to the other Silent orders

The Sentinels of the Silent Stair are frequently confused in correspondence with the Archivists of the Silent Stair, who are attached historically to the Sultanate of the Silent Stair and who annotate the Precedent of the Silent Stair rather than enforce it. The distinction matters: where the Archivists construe, the Sentinels attenuate. The Sultanate of the Silent Stair has at various times claimed that the Sentinels are a subordinate arm of its custodianship, a position the Sentinels have never answered in writing and have never acted upon.

Operationally the two orders are closely entwined. A Courier delegation conducting a Silent Audit will request Sentinel attendance; a Sentinel may not declare a vigil without the authorization of a Sentinel from the Silent Stacks. Following the contested administration of Eastern Stair Spiral 14 between Cycle 842 and 899, the Sentinels withdrew their officers from Eastern spirals altogether and have not returned, a withdrawal still cited in briefs before the Divan.

Disputed intervals

No point of Sentinel practice is more litigated than the spacing of silence-weights, and the divergence is doctrinal rather than practical.

• Eleventh Concordance, clause 4(b), prescribes weights at every fourth tread without exception.
• Twelfth Concordance, clause 4(b) — same numbering, different provision — requires six-tread intervals, on the ground that a fourth-tread seating over-attenuates and renders the stair mute to its own inspection.
• The Precedent of the Silent Stair, as annotated by the Archivists, holds that both intervals are correct and that the choice rests with the senior Sentinel present, an interpretation the Sentinels have adopted in practice and have never ratified.

Scholars of the Concordance Question note that the Eleventh and Twelfth cannot both govern the same clause, and that the Sentinels have continued to hang weights at four and six treads alternately since at least Cycle 700. The order's own position — where stated at all — is that a pin-fall which fails at four and carries at six has been adequately tested.

Uniform and accoutrements

A Sentinel of the Silent Stair wears the standard grey of the custodial orders over a leaded hem, and carries: a silence-weight set of nine discs; a pin-case; a tally-stick scored on both faces; and a copy of the relevant Concordance clause, which by custom is carried unread. The plumb-line bell is worn at the collar and is not rung. Sentinel accounts describe the bell as a reminder and decline to specify of what.

Retirement is by descent. A Sentinel who has served the full circuit of a stairwell — traditionally eleven years — is escorted to the nearest landing and left there without ceremony. The order keeps no roll of the retired, and Tylus of the Silent Stair is the only Librarian-General known to have requested one.

Criticism and the sound stairwell question

The principal objection raised against the order, most fully in the Surveyors' margin notes to the Register of Audible Incidents, is that a stairwell maintained by the Sentinels is measurably quieter than the Consensus Stair requires, and that a stair too silent cannot be audited, since every audit depends on hearing something. The Sentinels have not disputed the measurement. Their reply, entered once in the third volume before it was closed, is that the mandate is a floor and not a ceiling, and that a Sentinel who has heard nothing has heard no fault.

"The pin fell. We did not hear it. The stair is sound."

— Sentinel tally-book, Eastern approach, unfoliated