from  Lightning  at  Purfleet 
3i7 
and  that  they  be  terminated  with  pieces  of  copper  eighteen 
inches  long,  like;'thofe  already  erected:  and,  6.  thatthefe 
copper  terminations  be  very  finely  tapered,  and  as  acutely 
pointed  as.  poffible 
We  give  thefe  directions,  being  perfuaded,  that  ele- 
vated rods  are  preferable  to  low  conductors  terminated  in 
rounded  ends,  knobs,  or  balls  of  metal ; and  conceiving, 
that  the  experiments  and  reafons,  made  and  alledged  to 
the  contrary  by  Mr.  wilson,  are  inconclufive. 
March  12,  1778 
J.  PRINGLE,  P.  R.  S 
W.  WATSON. 
H.  CAVENDISH 
W.  HENLY. 
S.  HORSLEY. 
T.  LANE 
MAHON. 
EDWd.  NAIRNE. 
JOSEPH  PRIESTLEY 
S f 2 
