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.
f1-f2-stair-a-w221-diagnostic-placementverified · printed
Drawing identity
W221 · STAIR A BASEMENT 1ST & 2ND FLOORSTitle and drawing number read from the inspected IMG_1258 sheet.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: STAIR A BASEMENT 1ST & 2ND FLOORS / W221
One complete source and sequential crops from this same photograph were inspected after OCR/index review. Pixel distances were not treated as printed dimensions.
f1-f2-stair-a-w221-diagnostic-placementverified · printed
First-to-second total risers
UP 36 R36 count
Total marked rise from the first-floor plan.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
f1-f2-stair-a-w221-diagnostic-placementverified · derived
First-to-second floor rise
21 ft21 ft
Shared floor datums; does not establish local finish build-up.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
Calculated from: frame-second-floor-finish, frame-first-floor-finish
f1-f2-stair-a-w221-diagnostic-placementverified · derived
Equal-riser analytical height
7 in (21 ft / 36)0.583333 ft
Exact arithmetic from verified floor datums and the printed total count; local finish thickness remains unresolved.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
Calculated from: w221-f1-f2-rise, w221-f1-f2-total-risers
f1-f2-stair-a-w221-diagnostic-placementunreviewed · traced
Analytical flight display width
4 ft traced display width; not an accepted clear dimension4 ft · estimated uncertainty ±0.5 ft
Scaled only to keep the analytical tread surfaces inside the independently registered Stair A envelopes. No printed width has yet been accepted.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: SECTION A-A / SECTION C-C / SECTION D-D / SECTION E-E / MARBLE WALLS / MARBLE PANELS / PLASTER CORNICE / BRONZE HANDRAIL / HOSE CAB.
Sections establish the three-storey relationship and finish/component identities; they do not by themselves register the stair in building X/Z.
f1-f2-stair-a-w221-diagnostic-placementunreviewed · derived
Diagnostic X/Z placement uncertainty
2.5 ft conservative trace allowance2.5 ft
The diagnostic is fitted to the existing W3/W4 source traces. This is not an accepted W221 registration.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: SECTION A-A / SECTION C-C / SECTION D-D / SECTION E-E / MARBLE WALLS / MARBLE PANELS / PLASTER CORNICE / BRONZE HANDRAIL / HOSE CAB.
Sections establish the three-storey relationship and finish/component identities; they do not by themselves register the stair in building X/Z.
Calculated from: f1-stair-a-footprint-trace, f2-stair-a-footprint-trace
f1-f2-stair-a-w221-diagnostic-placementverified · observed
Accepted W221 building transform
UnresolvedWithheld until W221 is registered and checked against the plan grid, Elevator No. 1 enclosure and multiple independent controls.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: SECTION A-A / SECTION C-C / SECTION D-D / SECTION E-E / MARBLE WALLS / MARBLE PANELS / PLASTER CORNICE / BRONZE HANDRAIL / HOSE CAB.
Sections establish the three-storey relationship and finish/component identities; they do not by themselves register the stair in building X/Z.
f1-f2-stair-a-w221-diagnostic-placementverified · observed
Accepted physical Stair A geometry
NoneGenerated surfaces are zero-thickness evidence aids, not physical tread, riser, landing, stringer, soffit, rail or slab-opening construction.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: 1ST FLOOR PLAN / UP 36 R / 10 TREADS @ 10 1/2" = 8'-9" / 12 TREADS @ 10 1/2" = 10'-6" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
First-floor Stair A plan around Elevator No. 1.
IMG_1258 · sheet-W221 · Locate on drawing ↗Drawing notation: SECTION A-A / SECTION C-C / SECTION D-D / SECTION E-E / MARBLE WALLS / MARBLE PANELS / PLASTER CORNICE / BRONZE HANDRAIL / HOSE CAB.
Sections establish the three-storey relationship and finish/component identities; they do not by themselves register the stair in building X/Z.