Use this palaeographic utility to apply a stated dating, script, abbreviation, codicological, metrological, layout, or condition rule consistently while preparing manuscripts for scholarly review.

Chain #1

Chain-line spacing of sheet one in millimetres.

Laid #1

Laid-line spacing of sheet one in millimetres.

Chain #2

Chain-line spacing of sheet two in millimetres.

Laid #2

Laid-line spacing of sheet two in millimetres.

Tolerance

Allowed delta per spacing in millimetres.

Compare measured chain-line and laid-line spacings of two sheets and declare a probable twin (same paper stock) when both signed deltas fall within the stated default tolerance of one millimetre. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Chain delta

Signed chain-spacing difference (one minus two).

Laid delta

Signed laid-spacing difference (one minus two).

Probable twin

True when both deltas sit within tolerance.

• Script and manuscript evidence varies by language, region, institution, period, scribe, material, restoration, and cataloguing convention. A heuristic flag or score is not an authoritative date, hand attribution, reading, provenance, or conservation diagnosis.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Retain page images, scale, foliation, material, provenance, diplomatic transcription, uncertainty, and comparison exemplars; confirm conclusions with codicological context and specialist judgment.

• Two-Column Gutter Checker

  Check whether two measured columns plus their gutter reproduce the full text-block width within a stated default tolerance of one millimetre and report the signed discrepancy and the exact column-width ratio.

• Chain Line Spacing Classifier

  Classify a measured chain-line spacing against your own supplied reference range (required bounds, since paper stocks vary) as below, within or above the interval with exact comparisons.

• Nib / X-height Consistency Checker

  Check that repeated x-height measurements agree within tolerance under the stated rule: spread is (max-min)/mean in percent and the hand counts as consistent when spread does not exceed the tolerance (default 10%).