C 45* j 
Received Auguft, 1 7 <^ 7 » 
XLIV. Defeription of an EleElrometer in- 
vented by Mr. Lane ; with an Account 
of fame Experiments made by him with it : 
In a Letter to Benjamin Franklin, LL. D. 
F. R.S. 
Alderfgate-Street, O&ober 15, 1766. 
S I R, 
Read Nov. 26, E I N G employed in fome eleCtri- 
>767* ca i enquiries about the beginning of 
the year 1762, it occurred to me, that many experi- 
ments on this fubjeCt might be made with a much 
greater degree of precifion, if we could determine, 
with any tolerable accuracy, the comparative quan- 
tity of elettric fluid, with which, for any given ex- 
periment, the coated phial is impregnated. 
An inftrument, which I have contrived for this 
purpofe, may not improperly be called an Electro- 
meter. I have herewith fent you a drawing thereof 
[Tab. XX.] with the machine * to which i have 
fixed it. 
•* This portable machine is the contrivance of Mr. Read, 
mathematical inftrument maker at Knightfbridge, near London. 
M m m 2 Figure 
