2 $6  Papers  relative  to  an  Accident 
as  before,  the  charge  contained  therein  produced  no  ap- 
pearance of  light  whatfoever. 
exp.  iv.  But  when  a pointed  conductor  of  the  fame 
length  with  the  laft  was  put  in  its  place,  the  (mail  ft  ream 
of  light  appeared,  and  continued  viable  all  the  time  the 
model  was  moved  through  a fpace  equal  to  eighteen 
inches  and  a half. 
second  observation.  Thefe  laft  experiments,  com- 
pared with  the  former  two,  fhew  that  a rounded  con- 
ductor, little  more  than  one  foot  and  a half  above  the 
higheft  part  of  a building,  receives  a far  lefs  quantity  of 
the  matter  of  lightning  from  a cloud  fully  charged  there- 
with, than  a pointed  conductor  placed  tea  feet  above  a 
building,  circumftanced  alike  in  every  other  rdpeCt. 
Nay,  a pointed  conductor  of  the  fame  length  with  the 
fhort  one  that  was  rounded,  appears,  from  thefe  experi- 
ments, to  colleCt  a greater  quantity  of  the  fluid,  than, 
even  the  long  conductor  with  a rounded  end. 
The  difficulty  of  meafuring  exactly  the  effects,  when 
the  great  cylinder  was  charged,  was  fo  great,  that  after  a 
variety  of  endeavours  to  afcertain  the  quantity  of  the 
charge  remaining,  when  different  terminations  and  dif- 
ferent lengths  of  conductors  were  employed,  I was 
obliged  at  laft  to  have  recourfe  to  the  fenfe  of  feeling,  un- 
certain as  it  is,  in  many  cafes,  to  determine  the  different 
effeCts 
