432


BALL  BBARINQS


35    The  observed  moduli  of  elasticity  were  found  to  be

1
for  the  unhardened  cylinder  a  =  o  107  OOO

1
2,128^000

1


for  the  oil  hardened  cylinder

for  the  water  hardened  cylinder     a  =^ ,


2,102,000

36  The  difference  in  round  figures  between  the  lowest  and  highest
values  is  5/4  per  cent.  Since,  with  the  short  length  measured,  errors
of  observation  of  this  amount  are  not  impossible,  and  since  the  elastic
modulus  for  the  oil  hardened  cylinder  was  found  to  be  almost  identical
with  that  for  the  unhardened  one,  the  average  of  all  these  observations
was  taken  as  the  probable  value  for  the  water  hardened  cylinder  as
well.    This  is,  in  round  figures,

1
2,120,000


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Fia.5     BALL  STEEL  SUBMITTED  BY  THE  DEXHSCHE  WAFFEN  UND  MUNfTIONS

FABRIKEN.  BERLIN
CoMPBnnoir  Tmm  wnHCrLUfDnis  or  16  mm.  Diam.  48  mm.  Lbnotb.    Mbabubbd

DXBTANCB.  32  MM.
