Balance of Omission

Description

Balance of Omission is a beam scale used by Registrars to weigh a proposed entry against the potential of its omission, in units of contextual mass. It is the standard instrument of C.3: Material Omission and remains in continuous service despite three recorded attempts to replace it. The apparatus consists of a fulcrumed beam, two pans, and a graduated column of nested counters registered against a fixed index. When a Registrar places a proposed entry on the left pan, the right pan is loaded not with a counterweight but with the anticipated consequences of leaving the entry out; the beam settles or fails to settle accordingly.

The unit of measurement, contextual mass, is not reducible to any other unit held by the Tower. Efforts to calibrate the Balance against the Great Balance of Floor 11,304 have been abandoned twice, on the grounds that the two instruments report different quantities and that the comparison is therefore a category error of the sort not discussed in polite Concordance procedure.

Construction and Calibration

The original Balance was commissioned during the administration of the Kappa Omission and is believed to have been cast in the scriptoria of the lower annexes, though the Fourth Concordance attributes its construction to an unnamed contractor whose invoice survives without an accompanying receipt. The beam measures 1.2 metres between knife-edges. The pans, dished and of equal diameter, are engraved with the marks of the Registrars who have held office since the instrument's consecration.

Recalibration occurs at the turning of each administrative season. The procedure requires two registrars: one reads from the Redactions Copy, and the other records the deflection. Discrepancies greater than a third of a graduation are logged as Operational Audit findings and referred upward. Calibration records for the winter of Y1722 are missing; the responsible clerk, Hesper Quill, maintained until her retirement that she had filed them, and the Fifth Concordance partially upheld her claim by amending the filing date to a day on which the archive was closed.

Procedure

A proposed entry is placed on the left pan with its annexes folded beneath it. The Registrar then reads aloud, in a level voice, the consequences of omission as these are understood from prior rulings. The beam's deflection is read against the graduated column. A deflection toward the entry indicates that omission would cost more contextual mass than retention; a deflection away indicates the reverse. A level beam indicates indifference, which under Class 1: Ambiguous Omissions must be resolved by Doctrinal Review before either pan may be unloaded.

Under no circumstances may both pans be loaded simultaneously with the same entry, and neither may a Registrar leave the Balance unattended while a deflection is in progress. This second rule dates from the incident of Y1748, in which an unattended beam settled overnight against a proposed entry, and the entry was struck from the register before anyone noticed the office cat had been sleeping on the right pan.

Disputed readings

The principal scholarly disagreement concerns what the Balance measures when the entry weighed is itself a description of the Balance. Under Doctrinal Omission, such entries are held to be self-referential and are ordinarily set aside; under the rival reading advanced in the Seventh Concordance, they are admissible and their omission carries a contextual mass equal to their own weight, which produces an infinite deflection that the column was never designed to record. The two readings have coexisted since Y1811 without resolution, each citing the other's concordance as the source of its authority.

Whether the Balance measures omission or insistence is a related but distinct question. The Great Balance reports insistence outright; the Balance of Omission reports the difference between an entry's presence and its absence. Registrars are trained to state which quantity is being cited in any marginal note, though in practice the two are frequently confused, and the Symmetry Audit of Y1877 found that 41% of annotations on the lower shelves did not specify.

See also

• Residue Balance
• Scale of Precedence
• The Chamberlain's Omission
• The Practice of Cartographical Omission