CONTENTS IX 



PART IV. TIMBER ESTIMATING 



PAGE 



SECTION I. INTRODUCTION 161 



SECTION II. INSTRUMENTAL HELPS 162 



SECTION III. HEIGHT MEASUREMENT 165 



SECTION IV. VOLUME TABLES AND TREE FORM . . . 167 



SECTION V. PRACTICE OF TIMBER ESTIMATING ... 173 



A. Small and Valuable Tracts 174 



B. Larger and Less Valuable Tracts 186 



1. Type and Plot System 187 



2. The Strip System 188 



3. Line and Plot System 192 



C. Summary 195 



D. Pacific Coast Methods 196 



PART V. TABLES 

 SECTION I. Tables relating to Parts I and II 



1. STADIA REDUCTIONS 211 



2. SOLUTION OF TRIANGLES 212 



3. TRAVERSE TABLES 214 



4. LOGARITHMS OF NUMBERS 220 



5. LOGARITHMIC SINES, COSINES, TANGENTS, AND CO- 



TANGENTS 222 



6. SUPPLEMENTARY TABLES OF SMALL ANGLES .... 228 



7. NATURAL SINES AND COSINES 230 



8. NATURAL TANGENTS AND COTANGENTS 232 



9. SPECIMEN LETTERING 234 



SECTION II. Tables relating to Parts III and IV 



1. VOLUMES OF CYLINDERS (Locs) IN CUBIC FEET . . 236 



2. AREAS OF CIRCLES OR BASAL AREAS 238 



3. CORD WOOD RULE 239 



4. NEW HAMPSHIRE RULE 240 



5. NEW YORK STANDARD RULE 242 



6. SCRIBNER LOG RULE, LEGAL IN MINNESOTA . . . 243 



7. DECIMAL RULE OF THE U. S. FOREST SERVICE . . . 244 



8. DOYLE RULE 246 



9. MAINE LOG RULE 248 



10. QUEBEC RULE 250 



11. NEW BRUNSWICK RULE .... 253 



