3 holdings are shelved on this floor. A shared floor records where volumes sit and nothing about what any of them says; these are neighbours, not relations.

• MS 2154.27 Active vs. Passive Holding
• MS 6883.15 The Spiral Staircase of Presumed Symmetry
• MS 1751.39 Void-Weighing

  Void-weighing is the precise measurement of the mass (or, in more ambiguous contexts, the apparent weight) of objects and phenomena associat…