{
 "_coordinates": "x = feet east of the 1871 east line of Jefferson Street; y = feet north of the north building line of DeKoven Street; z = feet above lot grade. Sources: maps plan_coordinates.csv (Greeley-Carlson 1891 atlas plate 28, Cook County parcel 17-16-324-029, 1855 alley ordinance), Andreas 1885 vol. 2 pp. 708-717 (Dalton, Lee, McDermott, plat p. 717), Musham 1940 pp. 94-95 and plan p. 98, Abbott 1871 stereograph of the O'Leary cottage (CHM ICHi-02741), inquiry testimony as reported in the Chicago Tribune 25-26 Nov 1871.",
 "street": {
  "dekoven_width_ft": 60.0,
  "source": "Greeley-Carlson 1891 plate 28 ('60'); Musham 1940 plan ('60 feet wide'); Sanborn 1906 sheet 110"
 },
 "alley": {
  "width_ft": 15.0,
  "south_line_y": 100.75,
  "source": "1855 ordinance and 1891 plate (15 ft); Andreas plat draws 16 ft; Sullivan said 'about twelve feet'"
 },
 "lots": {
  "oleary_137": {
   "x0": 133.4,
   "x1": 158.4,
   "source": "E 1/2 of Lot 12, Block 38 (McDermott affidavit, Tribune 20 Oct 1871); lot lines from 1891 plate + parcel vertices, +-1.5 ft"
  },
  "dalton_135": {
   "x0": 158.4,
   "x1": 183.4,
   "source": "W 1/2 of Lot 11; 1891 house number 135 at this half-lot"
  },
  "forbes_lee_133": {
   "x0": 183.4,
   "x1": 208.4,
   "source": "E 1/2 of Lot 11"
  },
  "sullivan_134_south": {
   "x0": 183.5,
   "x1": 208.5,
   "source": "E 1/2 of Lot 18 south of DeKoven; 1891 number 134; Bales: Catherine Sullivan's 75-ft tract, house on its east half-lot, vacant middle half-lot (Andreas: vacant lot west of Sullivan's)"
  },
  "white_west_132_south": {
   "x0": 208.5,
   "x1": 233.5,
   "source": "Bales 2002 pp. 113, 195-199: William White's 'west parcel', 25 ft; Sullivan sat 'by a fence at the head of White's house or head of his lot'"
  },
  "white_east_130_south": {
   "x0": 233.5,
   "x1": 258.5,
   "source": "Bales: White's 'east parcel' = E 1/2 of Lot 19; 1869-70 directory 'White William, lab. r. 130 DeKoven'"
  }
 },
 "buildings": {
  "oleary_cottages": {
   "x0": [
    133.4,
    136.9
   ],
   "width": [
    15,
    17
   ],
   "y0": [
    1,
    3
   ],
   "depth": [
    36,
    40
   ],
   "floor": [
    1.5,
    2.5
   ],
   "eaves_above_floor": [
    8.5,
    9.5
   ],
   "ridge_above_floor": [
    12,
    15
   ],
   "ridge_axis": "N-S",
   "source": "Andreas p. 714 (two cottages, 36 ft N-S, front nearly on the building line); Musham 16 ft wide; stereograph: one storey, gable to the street, on posts; east passage 'a large passage ... enough to roll' (Mrs McLaughlin, transcript p. 238 via Bales p. 231), so the cottage stands 0-3.5 ft from the west line"
  },
  "dalton_house": {
   "x0": [
    158.4,
    159.4
   ],
   "width": [
    16,
    22
   ],
   "y0": [
    33,
    39
   ],
   "depth": [
    38,
    42
   ],
   "floor": [
    3.5,
    4.5
   ],
   "eaves_above_floor": [
    8.5,
    10.5
   ],
   "ridge_above_floor": [
    12,
    15
   ],
   "ridge_axis": "N-S",
   "source": "Andreas p. 714: on the west line of the lot, front 2 ft south of the north end of the O'Leary cottages, 40 ft deep, 4 ft above ground on cedar posts, one storey; width not recorded",
   "y0_rule": "oleary_cottages.y1 minus U(1,3) (Andreas: front 2 ft south of the north line of O'Leary's cottages)"
  },
  "forbes_cottages_133": {
   "x0": [
    183.4,
    189.4
   ],
   "width": [
    16,
    20
   ],
   "y0": [
    0,
    4
   ],
   "depth": [
    60,
    80
   ],
   "floor": [
    0.5,
    2.5
   ],
   "eaves_above_floor": [
    10,
    12
   ],
   "ridge_above_floor": [
    16,
    20
   ],
   "ridge_axis": "N-S",
   "source": "Andreas plat: '1 1/2 Story Cottage occupied by Walter Forbes (front), William Lee (middle), Morris Connovan (rear)'; footprint not drawn; Musham draws three cottages in a row"
  },
  "barn_133": {
   "x0": [
    183.4,
    183.4
   ],
   "width": [
    25,
    25
   ],
   "y0": [
    80.75,
    80.75
   ],
   "depth": [
    20,
    20
   ],
   "floor": [
    0,
    0
   ],
   "eaves_above_floor": [
    16,
    20
   ],
   "ridge_above_floor": [
    18,
    24
   ],
   "ridge_axis": "N-S",
   "source": "Andreas plat: '2 Story Barn 20 x 25' at the alley end of 133"
  },
  "dalton_shed": {
   "x0": [
    158.4,
    158.4
   ],
   "width": [
    18,
    22
   ],
   "y0": [
    88.75,
    88.75
   ],
   "depth": [
    12,
    12
   ],
   "floor": [
    0,
    0
   ],
   "eaves_above_floor": [
    7,
    10
   ],
   "ridge_above_floor": [
    8,
    12
   ],
   "ridge_axis": "E-W",
   "source": "Andreas p. 714: shed 12 x 20 at the rear of the lot on the west side"
  },
  "oleary_barn": {
   "x0": [
    133.4,
    134.4
   ],
   "y1": 100.75,
   "variants": [
    {
     "p": 0.5,
     "width": 16,
     "depth": 20,
     "source": "Andreas plat 1885 (drawn 16 E-W by 20 N-S, 9-ft passage on the east)"
    },
    {
     "p": 0.5,
     "width": 20,
     "depth": 16,
     "source": "Musham 1940 plan (20 E-W by 16 N-S, 5-ft passage)"
    }
   ],
   "ridge": [
    14,
    20
   ],
   "eaves_below_ridge": [
    3,
    5
   ],
   "ridge_axis_p_NS": 0.6,
   "source": "Sullivan: 16 x 20, 14 ft high; Musham: about 16 ft high, peaked roof; Rau: about 20 ft high; Board: 'two-story barn'; Andreas plat: '1 1/2 Story Barn'"
  }
 },
 "fences": {
  "dalton_west_fence_house_to_shed": {
   "x": 158.4,
   "height": 8,
   "source": "Andreas p. 714: 'a fence, eight feet high, ran from his house to his shed'"
  },
  "oleary_dalton_front_fence": {
   "x": 158.4,
   "y0": 0,
   "height": [
    0,
    7
   ],
   "p": 0.7,
   "source": "Musham 1940: 'high wooden fences separated the lots'; Bales p. 233: Mrs McLaughlin's testimony suggests another fence ran from the front of Dalton's house; existence and height not recorded"
  },
  "dalton_133_fence": {
   "x": 183.4,
   "y0": 0,
   "y1": 80.75,
   "height": [
    4,
    7
   ],
   "p": 0.7,
   "source": "as above"
  },
  "street_pickets": {
   "y": 0,
   "height": [
    3,
    4.5
   ],
   "source": "stereograph shows a picket fence in front of the O'Leary cottage"
  },
  "oleary_shed": {
   "p": 0.4,
   "x0": 149.4,
   "x1": 158.4,
   "y0": 88,
   "y1": 100.75,
   "height": [
    7,
    10
   ],
   "source": "Patrick O'Leary: 'in a shed outside were some coal and more wood'; Sullivan: 'the shed adjoining the barn'; position not recorded; placed in the east passage in 40% of samples"
  }
 },
 "observer": {
  "positions": {
   "P1_white_west_fence_Bales": {
    "x": [
     208.5,
     233.5
    ],
    "y": [
     -61,
     -56
    ],
    "note": "Bales's placement: against White's fence at the building line, in front of White's west parcel"
   },
   "P2_white_east_130": {
    "x": [
     233.5,
     258.5
    ],
    "y": [
     -61,
     -50
    ],
    "note": "in front of White's east parcel (No. 130)"
   },
   "P3_own_house_134": {
    "x": [
     183.5,
     208.5
    ],
    "y": [
     -61,
     -50
    ],
    "note": "Andreas 1885: 'sitting in front of his own house, nearly opposite'"
   },
   "P4_vacant_lot_136": {
    "x": [
     158.5,
     183.5
    ],
    "y": [
     -61,
     -50
    ],
    "note": "the vacant half-lot west of Sullivan's house"
   },
   "P5_opposite_oleary": {
    "x": [
     133.4,
     158.4
    ],
    "y": [
     -61,
     -50
    ],
    "note": "Board of Police report: 'on the sidewalk on the south side of DeKoven street, and nearly opposite Leary's premises'"
   },
   "P1b_white_west_midpoint_Bales": {
    "x": [
     218,
     224
    ],
    "y": [
     -60.5,
     -57.5
    ],
    "note": "Bales Appendix B: distance measured from the midpoint of White's west parcel; seated against the fence at the building line"
   }
  },
  "eye_heights": {
   "seated_at_grade": [
    2.5,
    3.8
   ],
   "seated_on_raised_walk": [
    3.8,
    5.0
   ],
   "standing": [
    5.0,
    5.8
   ]
  }
 }
}