gi  4 Papers  relative  to  an  Accident 
done,  for  the  prefervation  of  His  Majefty’s  magazines  at 
Purfleet:  we,  having  attentively  examined  the  experi- 
ments and  obfervations  of  Mr.  wilson,  contained  in  a 
paper  referred  to  the  Society  by  the  Board  of  Ordnance; 
and  having  maturely  confidered  the  fubjedt  at  large, 
Submit  it  as  our  opinion. 
1.  That  it  is  very  improbable,  that  the  powder  maga- 
zines, guarded  in  the  manner  in  which  they  are  at  pre- 
sent, fliould  receive  any  damage  from  lightning. 
2.  That  they  would  be  ilill  lefs  liable  to  be  injured  if 
three  other  elevated  pointed  rods,  limilar  to  thofe  already 
» 
eredted,  were  to  be  fixed  upon  the  roof  of  each  of  the 
five  magazines,  between  the  extreme  rods,  at  equal  dis- 
tances from  each  other,  with  three  if  rips  of  lead,  about 
one  foot  in  breadth,  ftrongly  connected  with  them,  and 
carried  down  the  roof,  from  the  ridge  to  the  eaves,  on 
each  fide  of  the  building;  thence  two  of  them  to  be 
continued  into  the  earth,  and  to  terminate  at  the  bottom 
of  wells ; one  of  which  fliould  be  dug  for  that  purpofe 
nearly  in  the  middle  of  each  of  the  intervals  between  the 
magazines,  deep  enough  to  contain  at  leafi:  four  feet  of 
water.  The  middle  Scrip  fliould  be  connected  with  the 
iron  rod  over  the  door,  hereafter  to  be  mentioned. 
We  alfo  advife,  that  other  high  pointed  rods  be 
eredted ; one  at  each  of  the  four  corners,  and  one  over 
each 
