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: Stair C first-to-second source-local flight register
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.
10 count
First-floor bottom horizontal up-flight only; 36 total risers from existing directional record retained separately.
Drawing notation: 10 TREADS @ 10½" = 8'-9"
First-floor bottom horizontal up-flight only; 36 total risers from existing directional record retained separately.
10.5 in
Scope is first-floor lower flight; full adjoining vertical chain and second-floor return flight still need targeted certification.
Drawing notation: 10 TREADS @ 10½" = 8'-9"
Scope is first-floor lower flight; full adjoining vertical chain and second-floor return flight still need targeted certification.
12 count
Vertical chain in first-floor plan, confirmed with master crop. Lower 10-tread chain retained from IMG_1113.
Drawing notation: 12 TREADS @ 10½" = 10'-6"
Vertical chain in first-floor plan, confirmed with master crop. Lower 10-tread chain retained from IMG_1113.
10.5 in
Middle-flight printed going only.
Drawing notation: 12 TREADS @ 10½" = 10'-6"
Middle-flight printed going only.
126 in
Printed middle-flight run; break/gate arrangement and actual physical endpoint classes still require review.
Drawing notation: 12 TREADS @ 10½" = 10'-6"
Printed middle-flight run; break/gate arrangement and actual physical endpoint classes still require review.
13 count
Candidate allocation, not a printed per-flight riser total.
Drawing notation: 12 printed treads + 1 terminal rise
Candidate allocation, not a printed per-flight riser total.
Calculated from: stair-companion1013b-img_1260-m005
11 count
Upper horizontal return flight in second-floor plan; printed chain legible.
Drawing notation: 11 TREADS @ 10½" = 9'-7½"
Upper horizontal return flight in second-floor plan; printed chain legible.
10.5 in
Upper-flight printed going only.
Drawing notation: 11 TREADS @ 10½" = 9'-7½"
Upper-flight printed going only.
115.5 in
Upper-flight printed product/run, separate from previously verified basement lower-flight identical notation.
Drawing notation: 11 TREADS @ 10½" = 9'-7½"
Upper-flight printed product/run, separate from previously verified basement lower-flight identical notation.
12 count
Candidate tread-plus-one allocation; actual nosing and landing conventions still unresolved.
Drawing notation: 11 printed treads + 1 terminal rise
Candidate tread-plus-one allocation; actual nosing and landing conventions still unresolved.
Calculated from: stair-companion1013b-img_1260-m009
36 count
Candidate 11+13+12 allocation agrees with existing UP36/DOWN36, which does not certify the per-flight allocation. Parent lower tread reading reused, not duplicated.
Drawing notation: (10 + 1) + (12 + 1) + (11 + 1) = 36
Candidate 11+13+12 allocation agrees with existing UP36/DOWN36, which does not certify the per-flight allocation. Parent lower tread reading reused, not duplicated.
Calculated from: stair-closeout1013a-img_1113-m008, stair-companion1013b-img_1260-m008, stair-companion1013b-img_1260-m012
46.5 in
First-floor lower up-flight strip width, witnessed through drawn boundary/rail region; no rail-face clearance certified.
Drawing notation: 3′10½″
First-floor lower up-flight strip width, witnessed through drawn boundary/rail region; no rail-face clearance certified.
46.5 in
First-floor vertical middle-flight strip witness; multiple shaft/string/rail lines prevent a finish-face equivalence claim.
Drawing notation: 3′10½″
First-floor vertical middle-flight strip witness; multiple shaft/string/rail lines prevent a finish-face equivalence claim.
60 in
First-floor bottom-right landing horizontal span from lower/middle flight junction to inner drawn wall line. No accepted closed landing polygon.
Drawing notation: 5′0″
First-floor bottom-right landing horizontal span from lower/middle flight junction to inner drawn wall line. No accepted closed landing polygon.
46.5 in
Second-floor upper horizontal return flight transverse witness. Bronze handrail overlaps source edge region; physical clearance remains unresolved.
Drawing notation: 3′10½″
Second-floor upper horizontal return flight transverse witness. Bronze handrail overlaps source edge region; physical clearance remains unresolved.
Numeric value unresolved
Fine upper right landing fraction not certified from this crop; no subtraction from overall chain.
Drawing notation: 4′[fractional inches not certified]
Fine upper right landing fraction not certified from this crop; no subtraction from overall chain.
Links the reviewed C plan strips by source numbering and the existing upper-chain scope. No duplicate tread/riser counts; no accepted cross-floor transform.
Drawing notation: [first-floor lower numbered strip proceeds right; middle strip proceeds up; second-floor upper strip proceeds left through25…36]
Links the reviewed C plan strips by source numbering and the existing upper-chain scope. No duplicate tread/riser counts; no accepted cross-floor transform.
Calculated from: stair-companion1013b-img_1260-m005, stair-companion1013b-img_1260-m009
Source-local turn handedness; both intermediate landing polygon limits and their elevations remain open.
Drawing notation: [two left turns: right→up→left; counterclockwise around Elevator No.2 in the paper x-right/y-up frame]
Source-local turn handedness; both intermediate landing polygon limits and their elevations remain open.
New boundary relationship, using existing material rule rather than repeating bronze as a new universal stair material assignment.
Drawing notation: [BRONZE HANDRAIL leader and rail line occupy shaft-side lower/upper flight boundary regions]
New boundary relationship, using existing material rule rather than repeating bronze as a new universal stair material assignment.
Calculated from: door-20261012a-1122-m005
Section B-B21ft chain is between finish-floor surface references, not soffit/rough-slab-bottom or rail-top planes. Prior exact floor interval reused; no new building coordinate.
Drawing notation: FIN. 1ST FLOOR / FIN. 2ND FLOOR [vertical witness terminates at finished walking surface/slab-top reference]
Section B-B21ft chain is between finish-floor surface references, not soffit/rough-slab-bottom or rail-top planes. Prior exact floor interval reused; no new building coordinate.
Numeric value unresolved
Wall finish build-up, rough structural reference and rail intrusion offsets remain unmeasured; section appearance cannot supply physical clear width.
Drawing notation: [finished floor lines, hatched structural support and rail lines shown separately]
Wall finish build-up, rough structural reference and rail intrusion offsets remain unmeasured; section appearance cannot supply physical clear width.
49.5 in
Upper right second-floor return landing projection from station25-side flight endpoint to inner drawn wall reference. Resolves prior fractional null, not clear width or a closed landing polygon.
Drawing notation: 4′1½″
Upper right second-floor return landing projection from station25-side flight endpoint to inner drawn wall reference. Resolves prior fractional null, not clear width or a closed landing polygon.
Source inventory is separate from the floor filters above. Select one drawing to inspect it; no drawing set is preloaded.