Vane of Stillness

Description

The Vane of Stillness is a tuning fork of blackened bronze, 214 mm in length, held on Floor 773 and used to record a Silence of a Particular Pitch. Unlike an ordinary fork, which reports the frequency of what is sounded into it, the Vane reports the frequency of what is absent: it is struck, held aloft, and its reading gives the pitch of the silence that follows. Readings are entered in the ledger of Floor 773 in half-semitone increments and are considered valid only when taken during the hours of low traffic in the adjoining corridors. The instrument rests, when not in use, on a cradle of felted iron mounted at the eastern edge of the reading gallery. Visitors are reminded that the gallery is unrailed.

Operation and theory

The Vane's operation rests on the proposition, first set out in the Vane Directives issued by Librarian-Superior Vane, that silence is not the absence of pitch but a pitch in its own right — one that instruments tuned to sound are constitutionally unable to hear. The Vane inverts the ordinary arrangement: its tines are damped with a resin compound so that they cannot ring freely, and the residual vibration, being entirely a product of the surrounding quiet, is transcribed by a hairline stylus onto a waxed drum. A Silence of a Particular Pitch, as catalogued, is distinguished from general quiet by duration and by a stable reading across not fewer than four consecutive minutes. The shortest recorded such silence is 4 minutes 12 seconds; the longest, 26 minutes, was logged in the winter of the eighty-first cycle and attributed to the temporary sealing of the adjoining stair during masonry work. Dispute surrounds the damped-tine method. The counter-argument preserved as The Chamber of Perfect Stillness Counter-Argument holds that the resin introduces an error of undetermined sign, and that readings taken before the forty-third cycle are therefore of uncertain validity. The Office of Stillness, which issues the annual Certificates of Stillness, has declined to annotate older certificates retrospectively, on the grounds that a certificate's date is part of its content.

Relation to the stillness offices

The Vane is not itself a ceremonial object, but its readings feed the calendar of the Solemnalia of Stillness administered by the Clerk of Stillness. A silence of the correct pitch, as determined by the Vane, is held to be the necessary precondition for the Stillness Phase; the Chamber of Perfect Stillness has on two occasions declared the Phase on the strength of a Vane reading alone, in both cases over written objection from the reading clerk on duty. Candidates for the office of Clerk of Stillness are examined while seated upon a Basalt of Stillness plinth in the Hall of Perfect Stillness, but the Vane is brought out only for the second part of the examination, when the candidate is required to describe, without hearing, what they have just not heard. Examiners report that the failure rate is not especially high, but that the failures are memorable. The Chamber of Stillness on Floor 771 holds a sister instrument of uncertain provenance. It has never been calibrated against the Vane, and the two are not to be used on the same day.

Custody

Custody of the Vane passed to the reading clerks of Floor 773 under an ordinance whose clause numbering has been amended twice. Under the second amendment, the Vane may not be carried down more than one floor at a time; under the third, it may not be carried at all if the carrying clerk has spoken that day. The latter restriction was the subject of a grievance filed by the clerk then on duty, who noted that the rule made it impossible to explain itself to a newcomer. The instrument is inspected each fourth cycle by an officer of the Librarians, who record the inspection but not its result.

See also

• Vane Directives
• The Luminous Stillness
• Preparatory Stillness
• Archivist-Provisional Isadora Vane