i95 
test  pieces.  This  contains  not  only  the  strength  perpendicular  to 
the  grain,  but  the  strength  in  flexure,  end  compression  and  shear. 
It  will  be  noted  that  the  Ohia  wood  is  to  be  classed  as  exception- 
ally strong  wood  in  flexure  and  end  compression  and  other  exhibi- 
tions of  strength.  It  is  unfortunate  that  there  are  not  available 
any  tests  of  white  or  red  oak  in  the  green  condition  in  the  form 
of  small  sticks  suitable  for  insertion  in  Table  3,  but  it  may  be 
stated  that,  in  these  tests,  Ohia  may  be  classed  with  the  strongest 
of  the  oaks. 
Table  4 gives  a detailed  statement  of  minor  tests,  the  average 
results  of  which  are  inserted  for  comparison  with  Table  3.  Re- 
ferring to  Table  4,  it  will  be  noted  that  the  resilience  to  maxi- 
mum load  is  an  indication  of  the  toughness  of  the  wood  to  with- 
stand shocks.  This  resilience  to  maximum  load  has  an  average  of; 
about  9.81  pounds  per  cubic  inch. 
This  is  somewhat  less  than  one-half  of  the  toughness  of  hickory. 
It  is  the  impression  of  the  writer  that  the  toughness  of  Ohia  and 
oak  are  about  the  same. 
Weight  of  Ohia  Wood. — It  has  been  stated  that  the  weight  of 
the  timber  is  high.  The  dry  specific  gravity  of  Ohia  wood  is  com- 
pared with  other  woods  as  follows : 
Ohia 64 
Red  Oak 61 
White  Oak  61 
Shortleaf  Pine  47 
Longleaf  Pine  58 
Conclusions. — On  the  whole,  this  wood  compares  with  the  best  * 
red  oak  in  point  of  strength.  The  lack  of  reliable  data  as  to- 
strength  of  white  oak  renders  a comparison  with  the  latter  species, 
difficult. 
Respectfully  submitted, 
W.  K.  Hatt, 
Civil  Engineer. 
Lafayette,  Indiana,  January  21,  1909. 
