C 52 ] 
perceptible, that if the non-electrical Conductors 
were properly difpofed, an Obferver might be made 
fcnfible ot the electrical Commotion quite acrofs 
the River Thames , by the Communication of no 
other Medium than the Water of that River. But 
as perhaps, in what relates to Electricity lefs than in 
any other Part of Natural Philofophy, we fhould 
draw Conclulions but from the Facts themfelves, it 
was determined to make the Experiment. 
The making this Experiment drew on many 
others, and as the Gentlemen concerned flatter 
themfelves that they were made with Pome De- 
gree of Attention and Accuracy, they thought it not 
improper to lay a Detail of all the Operations re- 
lating thereto, before the Royal Society. 
In order to try whether or ho the electrical Com- 
motion would be perceptible acrofs the Thames , it 
was abfolutely neceflary that a Line of non-electric 
Matter, equal in Length to the Breadth of the Ri- 
ver, fhould be laid over it fo as to touch the Water 
thereof in no Part of its Length ; and the Bridge at 
Weftminfter was thought the moft proper fo/tbat 
Purpole, where the Water from Shore to Shore was 
fomewhat more than 400 Yards. 
Accordingly on Tuejday July 14, 1747. to fee the 
Succels and aflift in making the Experiment, there 
met Martin Folkes Efq* Prefldent of the’ Royal 
Society , the Right Honourable the Earl Stanhope-, 
Richard Graham Efq; Nicholas Mann Efq; and" 
myfelf, with proper Perlons to execute what was 
required of them in the various Parts of thefe Ex- 
periments. 
t r * 
A 
