Every dimension belongs to an object and a drawing. Original room numbers, object marks, printed values and source regions stay together—even when the answer is unresolved.
464 of 464 photographs have extraction records, containing 27,517 properties. Initial image review is not exhaustive extraction: 0 photographs have passed the full-region check. 66 numbered sheets are reconciled. Modeling and architectural registration are separate work; these counts do not establish a complete building.
Download the structured register (JSON)Object: Broadway second-story steel-sash and plate-glass opening study
Printed values, calculations, image traces and observed counts are different kinds of evidence. “Verified” applies to the specific reading—not to the whole room or model.
1 count
One drawn prototype occurrence; installed quantity remains unresolved.
Drawing notation: STEEL SASH
Material/type label in the opening elevation.
1 count
Glass thickness and pane construction remain unresolved.
Drawing notation: PL. GLASS
Glass label in the opening elevation.
4 count
Topology only.
Drawing notation: STEEL SASH · PL. GLASS
Counted from the elevation; field widths are not assumed equal.
3 count
Topology only.
Drawing notation: STEEL SASH · PL. GLASS
Counted from the elevation; row heights are not assumed equal.
12 count
No metric size or operability is implied.
Drawing notation: STEEL SASH · PL. GLASS
Arithmetic from the independently counted rows and columns.
Calculated from: img1246-steel-sash-column-count, img1246-steel-sash-row-count
Preserved as printed text, not interpreted as a fraction or historical identifier.
Drawing notation: 2/10
Stacked circled mark; its callout semantics have not been resolved.
Source inventory is separate from the floor filters above. Select one drawing to inspect it; no drawing set is preloaded.