86 THE CONSTRUCTION OF LOG RULES 



scale carried to 60-foot logs. The taper allowed in this was is about half of the 

 average taper. 



The rule is used extensively in the pine-regions of Texas and gives a large over- 

 run. 



The same trouble was experienced with this rule as with the Scribner, in agreeing 

 upon an extension of values to cover logs less than 12 inches in diameter. The 

 values most commonly used are the so-called Devant extension, based upon the 

 Orange River rule, and agreeing closely with the Scribner extension. 



Lacking River Rule. No detailed knowledge. 



Northwestern Rule. A diagram rule for f-inch saw kerf. Erratic, and similar 

 to Scribner's. 



Ropp's Rule. A rule published by C. Ropp & Sons, Chicago. Based originally 

 on diagrams of 1-inch lumber for a J-inch saw kerf, it was reduced to a rule of 

 thumb which gives erroneous results especially for small logs, which are severely 

 under-scaled. The rule is therefore of no value. 



Warner Rule. A diagram rule with excessive allowance of f inch for saw kerf. 

 Worthless. 



Wheeler Rule. No detailed knowledge. 



Wilcox Rule. A diagram rule for f-inch saw kerf. Irregular. Low values. 



Younglove Rule. 1 Fitchburg, Mass., 1840. A caliper rule resembling the Baxter 

 in values. 



References 



General Treatises on Log Rules 



Relative Value of Round and Sawn Timber, James Rait, p. 114, Wm. Blackwood 



Sons, London, 1862. 

 The Measurement of Saw Logs (Universal Rule), A. L. Daniels, Bui. 102 Vermont 



Exp. Sta., 1903. 

 The Measurement of Saw Logs and Round Timber (Champlain Rule), A. L. Daniels, 



Forestry Quarterly, Vol. Ill, 1905, p. 339. 

 The Measurement of Saw Logs (International Rule), Judson F. Clark, Forestry 



Quarterly, Vol. IV, 1906, p. 79. 

 The Standardizing of Log Measures, E. A. Ziegler, Proc. Soc. Am. Foresters, 



Vol. IV, 1909, p. 172. 

 The Log Scale in Theory and Practice (Tiemann Log Rule), H. D. Tiemann, Proc. 



Soc. Am. Foresters, Vol. V, 1910, p. 18. 

 A Discussion of Log Rules, H. E. McKenzie, Bui. 5, California State Board of 



Forestry, 1915. 

 Review of Bui. 5, California State Board of Forestry, by H. D. Tiemann. Proc. 

 Soc. Am. Foresters, Vol. XI, 1916, p. 93. 



Specific Log Rules 



Scribner's Log and Lumber Book (Cubic Measure, Two-thirds Rule, Doyle Rule), 



S. E. Fisher, Rochester, N. Y., 1900. 

 Extending a Log Rule (Devant Extension of Herring Rule vs. Doyle Rule), E. A. 



Braniff, Forestry Quarterly, Vol. VI, 1908, p. 47. 

 Report of Commission to Investigate Methods of Scaling Logs in Maine (Holland 



Rule, Blodgett Rule, Hollingsworth & Whitney Rule), House Document No. 43, 



74th Legislature, Maine, 1909. 



1 Reference, Forestry Quarterly, Vol. XII, 1914, p. 395. 



