ILLUSTRATIONS. 



35 



FlGr. 8«. 



hi). 



90. 

 91. 

 92. 



93. 

 9i, 

 95. 

 96. 



97, 



98. 



99. 

 100. 

 101. 

 102. 

 103. 

 104. 

 105. 



Page. 



Relationship of different parts of same disk 340 



Yield of volatile oil fiom constant quantity of turpentine 340 



Diagram of detail analyses, representing radial dimensions of test pieces in each disk 344 



Variation of weight with height of tree 350 



Schematic section through stem of longleaf pine, showing variation of weight with height, diameter, 



and age 351 



Variation of compression strength with moisture 353 



Loss of water in kiln drying and reabsoiption in air, shrinking and swelling 354 



Relation of stiength in compression endwise to weight of material 367 



Relation of weight to Lending strength at rupture 368 



Strength of contiguous blocks, showing maximum uniformity of select quarter-sawed material in com- 

 pression endwise 370 



Relation of fiber stresses and distortion 373 



Distribution of internal stresses in a beam at rupture 373 



Position of neutral axis and interna 1 stresses at rapture of beam 373 



Fiber distortion in unit length of beam at elastic limit 374 



Position of neutral plane at rupture 375 



Method of sawing test logs 385 



Apparatus for determining specific gravity 38® 



Result of physical examination (sample) 389 



