B39 · Reference edition 2026.11
Clearance and fit — Recording and revision
Fit includes the stored object, support layers, access space and the way the enclosure is opened. These are separate considerations.
Scope and purpose
A reference record should allow another reader to reconstruct the intended description. Keep the identifier, context and revision together. When information changes, explain the change and retain enough of the earlier description to understand what was superseded.
Working notes
This collection describes enclosure forms, access routes and documentation practices for paper-based material. It is intended for reading and planning, not for directing treatment of fragile objects. Fold diagrams and record examples are original illustrations with no associated collection or accession data. Material descriptions distinguish observed features from documented properties. Decisions about a real object, its condition and its environment require the relevant professional judgement.
Practical example
Describe where clearance is intended rather than providing one unexplained overall allowance.
| Reference record | Interpretation |
|---|---|
| B39 | Clearance and fit |
| Scope and purpose | Fit includes the stored object, support layers, access space and the way the enclosure is opened. These are separate considerations. |
| Limits and interpretation | An overly tight enclosure can impede access; an overly loose one can allow movement. |
Review checklist
Check the identifier; describe the observation and its source; date the revision; link affected figures; distinguish confirmed facts from open questions.