{
  "source": "J. L. French and H. N. Eaton, Self-Siphonage of Fixture Traps, National Bureau of Standards Building Materials and Structures Report BMS126, issued October 15, 1951. Table 1 (p. 7) and the computations on p. 10, read from the page image (the OCR garbles the fractions). Figure 11 (p. 10) for the fifth trap.",
  "url": "https://nvlpubs.nist.gov/nistpubs/Legacy/BMS/nbsbuildingmaterialsstructures126.pdf",
  "fractions": "Each fraction is [whole, numerator, denominator] as printed; 17/16 is printed as an improper fraction.",
  "rows": [
    { "name": "1¼-inch adjustable cast brass", "fig": 7, "method": "formula",
      "t": [2, 0, 1], "tTable": "2.00", "ru": [0, 17, 32], "ro": [0, 1, 2],
      "cylPrinted": "31/32 inch or 0.969 inch", "cylDecimalPrinted": 0.969,
      "hcPrinted": 0.985, "hcPrintedText": "0.985 inch" },
    { "name": "1¼-inch drawn brass tubing", "fig": 8, "method": "formula",
      "t": [3, 3, 16], "tTable": "3.188", "ru": [0, 15, 16], "ro": [0, 13, 16],
      "cylPrinted": "1 7/16 inches=1.437 inches", "cylDecimalPrinted": 1.437,
      "hcPrinted": 1.53, "hcPrintedText": "1.53 inches" },
    { "name": "1¼-inch cast brass", "fig": 9, "method": "formula",
      "t": [1, 3, 4], "tTable": "1.75", "ru": [0, 17, 32], "ro": [0, 11, 32],
      "cylPrinted": "7/8 inch=0.875 inch", "cylDecimalPrinted": 0.875,
      "hcPrinted": 0.782, "hcPrintedText": "25/32 inch=0.782" },
    { "name": "1½-inch drawn brass tubing", "fig": 10, "method": "formula",
      "t": [3, 9, 16], "tTable": "3.563", "ru": [0, 17, 16], "ro": [0, 25, 32],
      "cylPrinted": "1 23/32 inches=1.697 inches", "cylDecimalPrinted": 1.697,
      "hcPrinted": 1.641, "hcPrintedText": "1 41/64 inches=1.641 inches" },
    { "name": "1½-inch cast brass", "fig": 11, "method": "torus",
      "t": [2, 1, 4], "tTable": "2.25",
      "hcPrinted": 1.18, "hcPrintedText": "1.18 inches", "zcPrinted": 1.07,
      "note": "Computed by NBS from the volume of a torus with a central angle of about 30 degrees (1.215 cubic inches, a 0.69 inch column in a tube of radius 0.75 inch); the remaining level is printed as 1.07 inches above the dip." }
  ]
}