Definitions for "Log Rule"
Keywords:  scribner, doyle, lumber, sawn, decimal
A table of values that gives estimated board foot contents for logs of various diameters and lengths. The three log rules most used in the United States are the International 1/4-inch, Scribner, and Doyle. Doyle is the most common log rule in the South and is the legal rule in many southern states.
A table intended to show the amounts of lumber that can be sawed from logs of different sizes under various assumed conditions.
A table showing the estimated or calculated amount of lumber (in board feet) that can be sawn from logs of given length and diameter. 1. Doyle rule. A simple formula used in the eastern and southern U.S. It underestimates the yield from small logs and over estimates with logs over 28 inches in diameter. 2. Doyle-Scribner rule. A combination rule, derived by using Doyle rule values for logs up to 28 inches in diameter and Scribner rule for logs larger than 28 inches. 3. International rule. A formula allowing Y2-inch taper for each 4 feet of length and Vs -inch shrinkage for 1-inch board. In one form, it assumes a V8 -inch kerf; in modified form, it assumes a V4 -inch kerf. 4. Scribner rule. A diagram rule, one of the oldest in existence. It assumes I -inch boards and V4 -inch kerf, makes a liberal allowance for slabs, and disregards taper. Official rule in many parts of the U.S., including the Pacific Northwest. 5. Scribner decimal C rule. The Scribner rule modified by rounding off the last digit to the nearest 10 and dropping the zero'. Zeroes are added to total of volumes. Used in Oregon and Washington.