8 1 2 Dr. musgrave’s Reafons for dijfenting 
diftance from the firlt, compatible with its giving a full 
and fmart exploiion, the point in that cafe will receive 
the exploiion at a much greater diftance than the ball. I 
was myfelf once prefent at an experiment, when the dif- 
ference was as 6 to i , that is, the ball would receive no 
exploiion at a greater diftance than|ths of an inch, when 
the point received it at fix times that diftance. On the con- 
trary, if the fecond conductor be put con fider ably within 
the diftance above defcribed, the ball will receive an ex- 
plofion much farther off than the point. Upon repeat- 
ing both thefe experiments lately with a fmall machine, 
I found the refult to be as follows. When the diftance 
between the firft and fecond conductor was i fth of an 
o 
inch, the point was ftruck at 2/- 6 -th of an inch ; but a ball 
of, i jths of an inch in diameter would not take the ftroke 
at more than one inch. But when the diftance between 
the conductors was only |ths of an inch, the point could 
not be ftruck at more than -|ths, whereas a ball of the 
fame diameter as before was ftruck at 7 inches and |, and 
a lefier ball T \tlis of an inch in diameter at 6 inches and 
rjths. I have been told alfo, but have not yet had time 
to verify it, that a medium diftance may be found, at 
which if the fecond conductor be fet, the point and ball 
prefented to the other end will be exactly upon a par. 
with refpeCt to the exploding diftance. 
Thefe 
