CONTENTS 



PAGE 



INTRODUCTION 5 



CONSTRUCTION AND UNDERLYING PRINCIPLES OF LOG RULES 6 



LOG RULES IN GENERAL 6 



THE THREE RULES MOST COMMONLY USED : 



The Spaulding Log Rule 7 



The Scribner Log Rule 10 



The Doyle Log Rule 13 



THE MCKENZIE LOG RULE ' 16 



Its Application 20 



A COMPARISON OF THREE DIFFERENT TYPES OF LOG RULES 30 



MISCELLANEOUS LOG RULES 38 



LOG RULES BASED ON STANDARDS 39 



THE TRANSFORMATION OF VOLUME TABLES BASED UPON A GIVEN 



LOG RULE TO VOLUME TABLES BASED UPON OTHER RULES 43 



THE TRANSFORMATION OF THE SCALE OF A NUMBER OF LOGS IN 

 THE AGGREGATE, BASED UPON A GIVEN LOG RULE, TO THE SCALE 

 OF THE SAME LOGS IN THE AGGREGATE, BASED UPON ANOTHER 



LOG RULE 49 



SUMMARY 51 



APPENDIX _ 53 



ILLUSTRATIONS 



PAGE 



FIG. 1. A Graphic Analysis of the Spaulding Log Rule ________________________ 8 



FIG. 2. A Curve Showing How Closely the Formula (.048D 2 2) B.M. Fits 



the Spaulding Log Rule ____________________________________________ 9 



FIG. 3. A Graphic Analysis of the Scribner Log Rule __________________________ 11 



FIG. 4. A Curve Showing How Closely the Formula (.048D 2 3)Z/ = B.M. Fits 



the Scribner Log Rule _____________________________________________ 12 



FIG. 5. A Graphic Analysis of the Doyle Log Rule _______________ _____________ 14 



FIG. 6. The Doyle Log Rule as Applied to a 6" Log ___________________________ 15 



FIG. 7. The Doyle Log Rule as Applied to a 30" Log ___________________________ 15 



FIG. 8. A Graphic Analysis of the McKenzie Log Rule 19 



