[ 333 3 
Recevied, April 22, 1773^ 
XXXV. An ExtraB of a Letter from 
Dr. Nooth to Dr. Franklin, F. R. S \ 
on fome Improvements in the EleBrical 
•Machine. 
Read June 24, 'g’T muft undoubtedly appear ex- 
l77j ’ * traordinary, that, in the prefent 
age, when the ftudy of eledricity is become fo ge* 
neral, and the advances that have been made in the 
fcience are fo very confiderable, I fhould attempt 
to recall your attention to the ftrudure of the elec- 
trical machine. But I believe it muft be allowed, 
that, notwithftanding the remarkable progrefs that 
has of late been made in eledrical purfuits, the 
machine ftill remained the mofl imperfed part of 
the apparatus. The conftrudion of it has been 
in general left to the workman, who has feldom 
been in a capacity of making thofe improvements 
in it, which it certainly admits of. 
The fubjed, however, feems well worth the 
attention of the electricians themfelves ; as a know- 
ledge of the means of correding the capricious 
(late of their machines will enable them to purfue 
X x a their 
