252.  Papers  relative  to  an  Accident 
covered  with  tin-foil,  excepting  eight;  for  thefe  being 
brafs,  required  to  be  covered  only  at  their  joinings.  All 
thefe  drums  together  formed  a cylinder  above  one  hun- 
dred and  fifty-five  feet  in  length,  and  above  fixteen 
inches  in  diameter. 
The  whole  cylinder  was  made  in  four  feparate  parts ; 
three  of  thofe  parts  could  eafily  be  made  to  communi- 
cate, or  not,  with  each  other:  the  fourth,  being  brafs, 
was  referved  for  a different  purpofe.  The  feveral  ends 
of  thofe  four  parts  were  clofed  up  with  board,  rounded 
off  at  the  edges  in  every  part,  and  covered  with  tin-foil 
likewife. 
This  great  cylinder  (confifting  of  the  three  parts)  was 
fufpended  about  five  or  fix  feet  from  the  floor  by  filk 
lines ; and  formed  a curve  in  the  room,  fomething  like 
anhorfe-fhoe ; one  end  of  which  hung  over  the  middle  of 
the  long  frame,  on  which  the  model  was  propofed  to 
move;  the  other  (which  I call  the  farther  end)  was  joined 
occafionally  to  the  end  of  a long  wire,  that  was  fufpended 
through  the  whole  fpace  of  the  room.  And  left  the  fe- 
veral atmofpheres  round  this  wire,  in  its  charged  ftate, 
might,  in  confequence  of  the  unavoidable  returns  of  the 
wire,  interfere  too  much  with  each  other,  it  was  fuf- 
pended in  fuch  a manner  (by  filk  lines  alfo)  that  each 
length  was  five  or  fix  feet  from  its  neighbour : and  thofe 
that  were  fufpended  neareft  to  the  great  cylinder  hung  at 
4 the 
