[ io8 ] 
of the Glafs: As a great Part of this Surface was 
without Contact, occafioned by fuch of the Shot as 
pof ntcd themfdves thereto, touching, from their 
fph'erical Figure, only in one Point, there confe- 
quenrly remained without Contact comparatively 
great Spaces between each Shot. This Defect was 
obviated by the un.verfal Contact of the Silver, and 
thereby was occasion'd the greater Explofion. 
§ XV. 1 he following Experiment has home Re- 
lation to the preceding. If a Phial of warm Water, 
without being coated with Sheet-Lead, or other 
non -electrical Matter, is electrifed by connecting it 
to the prime Conductor } and a Ring of fmallWire, 
in lieu of the ufual Coating, is put round this Phial, 
the Wire being continued of a fufficient Length 
to touch, the prime Conductor ; upon difcharging 
the Phial, you have a flight Explofion, and a Flafh 
of Fire feems at that Inftant to fill the Glafs. But 
if this Experiment is made in a very dark Room, 
and with great Attention, this Elafh in the Phial 
will not then feem to proceed from the whole Quan- 
tity of Water contained therein ; but, as far as the 
Suddennefs of the Expiofion will permit the Eye to 
follow it, will be feen to occupy only the internal 
Surface of the Phial. 
* 
§ XVI. I order’d another glafs Jar as large aspof- 
fible to be blown, fo that the Glafs thereof might 
be very thin ; and after many Attempts of the Glals- 
makers I procured one, the Height of which was 
twenty two Inches, the Periphery forty-one. This 
was covered within and without, leaving a Margin 
of 
/ 
