[ 77 3 
As only one Shower of Rain had fallen during 
the preceding five Weeks, the Ground could not 
but be very dry ; and as no Water was near, if the 
ele&rical Commotion was felt by the Obfervers at 
the Stations, it might be fafely concluded, that 
Water had no Share in conducing it. 
Aaguft 14. 1747. there met at Shooters Hill for 
this Purpofe, the Rev. Mr. Birch , the Rev. Mr. Pro* 
fefior Bradley , Beter Haval Efq; Mr. George Gra- 
ham , R. Graham Efq; Mr. Nourfe , George Lewis 
Scott Efq; Mr. Short , Charles Stanhope Efq; and 
myfeif, who were of the Royal Society , and Dr, 
Bevis. 
It was here determin’d (as- the Gentlemen were 
fatisfied from many of the former Trials, that if, 
when the coated Phial was difcharged, the Ob- 
fervers at the Stations flood upon Originally -Elec- 
trics, and touched neither Water nor Ground with, 
iron Rods, or any Part of their Bodies, the electri- 
cal Commotion would be fcarcely perceptible) to 
make twelve Explofions of the coated Phial, with 
an Obferver placed at the feveri Mile-Stone, and 
another at the nine Mile-Stone, both (landing upon 
Wax, and touching the Ground with an iron Rod. 
This Number of Explofions was thought more ne- 
ceflary, as the Obfervers at thefe Stations were not 
only to examine whether or no the EleCtriciry 
would be propagated to fo great a Diftance; but if 
were, the Obferver at the feven Mile-Stone was by 
a fecond Watch to take notice of the Time lapfed 
between feeling the electrical Commotion, and 
hearing the Report of a Gun fired near the Machine,, 
as clofe as might be to the Inftant of making the 
Explofion : 
