CHAP. IX.] 



BRITISH OAK. 



5 1 



TABLE VI. ENGLISH OAK. 

 Transverse Experiments. Second Example. 



REMARKS. No. 7 broke short : 8 and 12 with 7 to 13 inches length of fracture ; 9, 

 10, and ii with 15 inches scarph-like splintery fracture. 



The Tables V. and VI. each refer to parcels of six 

 pieces, which were taken from trees of good average 

 quality and size, moderately seasoned, and fit to be 

 applied to architectural works, the specific gravity vary- 

 ing from 670 to 905 in one set, and 780 to 1005 m the 

 other. Of the twelve pieces tested, the elasticity of two, 

 after the weight of 390 Ibs. was removed, was perfect. One 

 piece recovered its straightness to within '312 inch, 

 while of the remainder, nine in number, the elasticity 

 was in all something better, though not quite perfect. 



The deflections varied under this weight of 390 Ibs. 

 from 3-125 to 3*625 inches in one set, and from I '5 to 

 i "75 inch in the other, the ultimate deflections at the 

 crisis of breaking varying from 5-25 to ii'OO inches, 

 and 4*125 to 9-50 inches, respectively; while the break- 



