66  Mr.  hutton  on  the  initial 
eight  ounces  to  a charge,  which  was  always  put  into  a 
light  flannel  bag,  and  rammed  more  or  lefs,  as  exprelfed 
in  each  day’s  experiments,  but  without  ever  uling  any 
wad  before  it. 
The  diftance  of  the  gun  from  the  pendulum  was  2,9 
or  3 o feet ; which  diftance  was  found  by  firing  the  piece, 
with  eight  ounces  of  powder  without  a ball,  at  different 
diftances,  till  the  force  of  the  elaftic  fluid  was  found  not 
to  move  the  pendulum. 
The  penetrations  of  the  balls  into  the  wood  were  at- 
tempted to  be  taken,  but  were  foon  neglected  on  account 
of  their  uncertainty,  becaufe  of  fo  many  balls  ftriking  in 
or  near  the  fame  part  of  the  wood.  The  depth  of  the 
penetration  feemed  to  be  near  about  three  inches  in  folid 
wood  when  two  ounces  of  powder  was  ufed. 
The  firft  courfe  of  experiments  was  on  the  1 3th  of 
May,  1 7 7 5,  it  being  a clear,  dry  day.  The  weights  and 
meafures  then  taken  were  thus,  viz. 
p = 328  pounds,  the  weight  of  the  pendulum, 
g - 72  inches,  the  diftance  of  the  center  of  gravity, 
h — 88  inches  - 7\  feet,  the  diftance  of  the  center  of 
ofcillation, 
r - 1 o 2-i  inches,  the  diftance  to  the  bottom  or  tape. 
The  value  of  h - 8 8 was  determined  from  the  number 
of  forty  vibrations  being  made  in  a minute;  for  as 
4 
