Dashboard · Argentina programme · Replica plans · 3D model · How measured
How this was measured
- Measured 10
- Scaled 18
- Inferred 15
- Gaps 3
"Precise" here means that every number traces to its evidence and carries an honest tolerance. Nothing is drawn as more exact than its source.
Sources, best first
Four layers
- Measured: the room sizes written on the National Monuments Record card by H. J. Thomas after his visit of 26 April 1974 (hall 15 ft 11 in by 15 ft 3 in; passage 5 ft by 15 ft 3 in; kitchen 16 ft 1 in by 15 ft 6 in; beams about 11 in square; wing about 22 ft by 29 ft). Converted at 0.3048 m per foot. Tolerance ±0.02 m.
- Scaled: the outline of the house, its wing and stair compartment, read off a copy of the fair-drawn 1:100 plan NA/GL/89/208. The copy was calibrated from the two stated room lengths. Tolerance ±0.3 m (±0.4 m for the wing). The farm ranges were traced from the OS 25-inch map of about 1900 (1:2500): ±1 m on their sizes, about ±3 m on position.
- Inferred: what no record states: wall heights, roof pitch, door and window positions, fireplace widths, the wing's inner walls. Each is set from period practice and the Cadw photographs of 29 July 1988, and drawn dashed.
- Gap: what cannot yet be drawn: the first floor and roof trusses (not examined in 1974), the 19th-century east extension, the yard and boundary walls.
Checks
Does it hold together?
- The wall thickness implied by the plan, (6.25 − 4.648) ÷ 2 = 0.801 m, matches the "fairly thick walls" on the card.
- The three rooms and two partitions leave 1.486 m for each gable with its chimney breast: in line with the end-chimney plan recorded in NA/GL/88/49.
- With its stair compartment the wing runs 9.24 m east to west on the plan, within 0.4 m of the 29 ft written on the card.
- The plan, placed on the 25-inch map, matched the hatched house there to within about 1 m.
The register
Every value
| ID | Element | Value | Tol. (m) | Confidence | How, and evidence |
|---|---|---|---|---|---|
| H01 | Farmhouse main range external length E-W | 15.25 m | ±0.3 | scaled | Outline scaled off a copy of the 1:100 plan; scale calibrated from the two stated room lengths (hall 15 ft 11 in, kitchen 16 ft 1 in) at 34.1 px/m EV-0631 |
| H02 | Farmhouse main range external depth N-S | 6.25 m | ±0.3 | scaled | As H01 EV-0631 |
| H03 | Kitchen (east room) internal length E-W | 4.902 m | ±0.02 | measured | Stated 16 ft 1 in, converted EV-0630 |
| H04 | Kitchen (east room) internal width N-S | 4.724 m | ±0.02 | measured | Stated 15 ft 6 in, converted EV-0630 |
| H05 | Cross passage internal width E-W | 1.524 m | ±0.02 | measured | Stated 5 ft, converted EV-0630 |
| H06 | Cross passage internal length N-S | 4.648 m | ±0.02 | measured | Stated 15 ft 3 in, converted EV-0630 |
| H07 | Hall (west room) internal length E-W | 4.851 m | ±0.02 | measured | Stated 15 ft 11 in, converted EV-0630 |
| H08 | Hall (west room) internal width N-S | 4.648 m | ±0.02 | measured | Stated 15 ft 3 in, converted EV-0630 |
| H09 | Front and rear walls thickness | 0.801 m | ±0.16 | scaled | (external depth H02 minus hall width H08) / 2; the card records fairly thick walls EV-0630, EV-0631 |
| H10 | Partitions hall/passage and passage/kitchen thickness | 0.5 m | ±0.15 | inferred | Typical rubble partition; not dimensioned on any source held EV-0629 |
| H11 | West and east gables thickness incl. chimney breast | 1.486 m | ±0.35 | inferred | (external length minus three room lengths minus two partitions) / 2; both gables held end fireplaces EV-0630, EV-0631 |
| H12 | North wing overall size (card) | 6.706 x 8.839 m | ±0.3 | measured | Stated "about 22 ft x 29 ft overall", converted EV-0630 |
| H13 | North wing external E-W x N-S (plan) | 7.92 x 6.45 m | ±0.4 | scaled | Scaled as H01; with the stair compartment the E-W run is 9.24 m, within 0.4 m of the 29 ft on the card EV-0631 |
| H14 | Stair compartment (wing, wooden stair) external size | 1.32 x 2.78 m | ±0.3 | scaled | Scaled as H01 EV-0631 |
| H15 | Kitchen beams A, B, C and passage beam section | 0.279 m | ±0.03 | measured | Stated "about 11 ins square", adze cut, broad chamfer, ogee stops EV-0630 |
| H16 | Kitchen beams count and span direction | 3, spanning N-S | ±0.5 | inferred | Count stated; spacing and direction not stated (drawn at equal spacing) EV-0630 |
| H17 | Hall fireplace position | west gable | ±0.3 | inferred | Stated; opening width drawn 1.8 m (typical, not stated) EV-0630 |
| H18 | Kitchen fireplace position | east wall | ±0.3 | inferred | Stated "large fireplace (recently rebuilt on old lines)"; opening drawn 2.0 m (not stated) EV-0630 |
| H19 | Newel stair position | NW angle of hall | ±0.3 | inferred | Stated; drawn as 1.5 m circle (typical) EV-0630 |
| H20 | Opposed doors position | both lateral walls of the passage | ±0.2 | inferred | Stated "appears originally to have had opposed doors"; door width 1.0 m drawn (not stated) EV-0630 |
| H21 | Cellar position and form | below the wing dairy; barrel-vaulted | inferred | Stated; size not recorded EV-0630 | |
| H22 | Eaves height (main range) above ground | 5.2 m | ±0.7 | inferred | Wall height read against the front length on the photograph; foot of wall hidden by the boundary wall, so a wide tolerance EV-0095, EV-0630 |
| H23 | Roof pitch (main range) pitch | 30.0 deg | ±7 | inferred | Card records a "low pitched slate roof"; 30 deg is typical for 19th-century Welsh slate EV-0630 |
| H24 | Ridge height (main range) above ground | 7.0 m | ±0.9 | inferred | eaves + half depth x tan(pitch) |
| H25 | North wing eaves and ridge above ground | 5.0 / 6.86 m | ±1.0 | inferred | Wing roof not visible on the photograph; set just below the main range EV-0095 |
| H26 | Chimney stacks count and position | 3: west gable, central, east gable | ±1.2 | scaled | Counted on the photograph; the central stack lies near the middle of the range (photo estimate 8.5 m from the west face, +/-1.2 m) EV-0095 |
| H27 | Front (south) first-floor windows count | 3, symmetrical front | ±1.0 | inferred | Count read on the photograph; card records a "symmetrical front"; positions drawn symmetrical (not measured) EV-0095, EV-0630 |
| H28 | Front porch position | over the passage door | ±1.0 | inferred | Porch seen on the photograph; position consistent with the passage within tolerance EV-0095 |
| H29 | Walling and roofing material | local lias limestone rubble, rendered; slate roof | measured | Stated EV-0629, EV-0630 | |
| H30 | East 19th-century extension size | not recorded | gap | Card records "further extensions" on the east side; no size. See Range A EV-0630 | |
| H31 | First floor and roof trusses layout | not recorded | gap | "it was not possible to examine the first floor and roof trusses" EV-0629 | |
| OA | Range A, angled off the east gable (OS c.1900) sides (clockwise from first corner) | 23.24 / 5.47 / 23.0 / 5.12 m | ±1.0 | scaled | Traced off the 25-inch sheet, placed on the same local grid as the house OS 25-inch (NLS) |
| OAa | Range A, angled off the east gable (OS c.1900) footprint area | 120.8 m2 | ±28.4 | scaled | From the traced outline OS 25-inch (NLS) |
| OB | Range B, L-shaped range to the west (OS c.1900) sides (clockwise from first corner) | 8.1 / 14.96 / 15.59 / 4.82 / 23.15 / 23.84 m | ±1.0 | scaled | Traced off the 25-inch sheet, placed on the same local grid as the house OS 25-inch (NLS) |
| OBa | Range B, L-shaped range to the west (OS c.1900) footprint area | 278.8 m2 | ±45.2 | scaled | From the traced outline OS 25-inch (NLS) |
| OC | Range C, north range (OS c.1900) sides (clockwise from first corner) | 20.23 / 4.27 / 19.99 / 4.67 m | ±1.0 | scaled | Traced off the 25-inch sheet, placed on the same local grid as the house OS 25-inch (NLS) |
| OCa | Range C, north range (OS c.1900) footprint area | 89.6 m2 | ±24.6 | scaled | From the traced outline OS 25-inch (NLS) |
| OD | Building D, small west building (OS c.1900) sides (clockwise from first corner) | 4.12 / 3.67 / 4.12 / 3.67 m | ±1.0 | scaled | Traced off the 25-inch sheet, placed on the same local grid as the house OS 25-inch (NLS) |
| ODa | Building D, small west building (OS c.1900) footprint area | 15.1 m2 | ±7.8 | scaled | From the traced outline OS 25-inch (NLS) |
| O-h | Outbuildings eaves height | 4.5 m | ±1.0 | inferred | Two-level barn front with cart arches; not scaled; which traced range was the barn standing in 1988 is not checked EV-0094 |
| S01 | Site SW corner of main range, British National Grid | E 316797.5 N 173305.9 m | ±3.0 | scaled | Plan outline fitted to the hatched house on the 25-inch sheet; fit within about 1 m EV-0631 |
| S02 | Site long axis bearing | 89.1 deg true | ±2 | scaled | Best fit of the plan to the map; insensitive within 2 deg |
| S03 | Site house centroid to church centroid | 38 m | ±3 | scaled | Scaled; the house stood on the edge of the scarp north of the churchyard (card) EV-0630 |
| S04 | Site ground level at house / at church | 37.9 / 42.2 m OD | ±2.0 | scaled | Smoothed model; ground falls to the north |
| S05 | Holding area | 5.30 acres (2.145 ha) | measured | Stated area; boundary not yet drawn on this plan EV-0014, EV-0023 | |
| S06 | Yard and boundary walls layout | not drawn | gap | Open yard between the house and the ranges on the 25-inch sheet; walls not traced in this pass |
Sources held as transcripts on the evidence pages; the original cards are at the National Monuments Record of Wales. Map tiles: OS 25-inch County Series via the National Library of Scotland. Version 0.1, 31 October 2026.