[ 339 ] 
tlon, a£ts as a conductor in reftoring the fire again 
to the cufhion ; and that thus, by an improper dif- 
pofition of it, we fupprefs, inftead of increafing, 
the quantity of the excited matter. 
In fhort, when an electrician attends to the pre- 
ceding principles in the conftruCtion of his rubber, 
and to the proper difpofition of the amalgam, he has 
nothing to fear from the humidity of the atmofphere, 
as his machine will work equally well in all kinds 
of weather. The reft of the ele&ricai apparatus 
may be made according to the directions that have 
been given by the different ele&rical writers. Each 
has had his favourite machine j and, perhaps, no 
one has been yet contrived that has not had its pecu- 
liar advantages. 
vol. Lxni. 
Yy 
Received 
