72 



Table 45. 

 STRENGTH OF MATERIALS. 



Average Results o! Timber Tests. 



The test pieces were small and selected. Endwise compression tests of 

 some of the first lot, made when green and containing over 40 per cent moisture, 

 showed a diminishing in strength of 50 to 75 per cent. 



See also Table 46. A particular sample may vary greatly from these data, 

 which can indicate only in a general way the relative values of a kind of timber. 

 Note that the data below are from selected samples and therefore probably high. 



The upper lot are from the U. S. Forestry circular No. 15 ; the lower from the 

 tests made for the loth U. S. Census. 



Smithsonian Tables. 



