from  Lightning  at  Purfleet,, 
3i3 
Feef.  In. 
ibs< 
d 
O 
4-» 
V 
c 
• »H 
fl- 
ea 
<4H 
o 
T3 
i-l 
• ^ • 
-cl 
4-»  G 
• o 
CD 
G 
o. 
o 
<u 
*rt 
rt 
O 
& 
D 
Length  of  the  model, 
Breadth, 
Heighth  to  the  top  of  the  parapet, 
Roof  above  the  parapet, 
Chimnies  exceeded  the  high  eft ) 
part  of  the  roof,,  about  ) 
Pointed  conductor  when  fixed] 
upon  the  roof,  - / 
Length  of  ftiort  fpout, 
Length  of  long  fpout  in  its] 
bent  ftate,  - - J 
The  two  pofts  or  pillars  to  fup-  ) 
port  the  ciftern  (which  cif-( 
tern  was  lined  with  lead)( 
belonging  to  the  fhort  fpout,  J 
9? 
<*  6 
ITr 
4t 
3j 
10 
I iol 
1- 
&■ 
5.  A Report  of  the  Committee , appointed  by  the  Royal  So- 
ciety, to  conjider  of  the  mojl  effectual  method  of  fecuring 
the  Powder  Magazines  at  Purfleet  againfl  the  Effedls 
of  lightning ; in  compliance  zvitb  the  Requeji  of  the 
Board  of  Ordnance,. 
IT  being  referred  to  us  to  confider,  whether  any-, 
thing  more  than  what  was  formerly  directed  by  the. 
committee  of  the  Royal  Society  in  the  year  177  2 can  be.. 
done, , 
