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  1. "File ENGLISH.MTH, copyright (c) 1990-2000 by Texas Instruments Incorporated"
  2.  
  3. "Defines English measurement units in terms of feet, pounds, and seconds:"
  4.  
  5. foot:=
  6.  
  7. inch:=1/12*foot
  8.  
  9. mil:=1/1000*inch
  10.  
  11. yard:=3*foot
  12.  
  13. fathom:=6*foot
  14.  
  15. rod:=16.5*foot
  16.  
  17. mile:=5280*foot
  18.  
  19. furlong:=1/8*mile
  20.  
  21. league:=3*mile
  22.  
  23. acre:=1/640*mile^2
  24.  
  25. gallon:=231*inch^3
  26.  
  27. quart:=1/4*gallon
  28.  
  29. pint:=1/2*quart
  30.  
  31. barrel:=31.5*gallon
  32.  
  33. pound:=
  34.  
  35. ounce:=1/16*pound
  36.  
  37. ton:=2000*pound
  38.  
  39. second:=
  40.  
  41. minute:=60*second
  42.  
  43. hour:=60*minute
  44.  
  45. day:=24*hour
  46.  
  47. week:=7*day
  48.  
  49. fortnight:=2*week
  50.  
  51. year:=365.2422*day
  52.  
  53. decade:=10*year
  54.  
  55. century:=100*year
  56.  
  57. meter:=1/(0.3048)*foot
  58.  
  59. gram:=1/(453.59237)*pound
  60.