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The formula used to calculate the volume is:

\[ \text{Volume} = \frac{(D - 4) \times \left(\frac{D - 4}{2}\right) \times L}{8} \]

This rule appeared about the same time as the Doyle log rule, and its results are identical to those of the Doyle log rule.

Steps to calculate the volume:

- Measure the diameter on the small end of the log in inches.
- Subtract 4 inches from the diameter.
- Multiply this amount by half of the remainder.
- Multiply this result by the length of the log in feet.
- Divide the previous amount by 8.

Let's assume the following values:

- Diameter = 20 inches
- Length = 16 feet

Using the formula:

\[ \text{Volume} = \frac{(20 - 4) \times \left(\frac{20 - 4}{2}\right) \times 16}{8} = 32.0 \]

Diameter (inches) | Length (feet) | Volume |
---|---|---|

6 | 16 | 4.0 |

8 | 16 | 16.0 |

10 | 16 | 36.0 |

12 | 16 | 64.0 |

14 | 16 | 100.0 |

16 | 16 | 144.0 |

18 | 16 | 196.0 |

20 | 16 | 256.0 |

22 | 16 | 324.0 |

24 | 16 | 400.0 |

26 | 16 | 484.0 |

28 | 16 | 576.0 |

30 | 16 | 676.0 |

32 | 16 | 784.0 |

34 | 16 | 900.0 |

36 | 16 | 1,024.0 |