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Vlf. An Account of an Experiment , concerning an 
Endeavour to produce Light thro * a MetallickfBody y 
under the Circumftances of a Vacuum and Attri- 
tion . By Mr. Fr. Hauksbee, F.Q^.S. 
I T may be remembred, what fuccefs I had in produ. 
cing Light through Bodies, fuch as Sealing Wax, 
Fitch, and common Sulphur 5 which gave me fome pro- 
bability, that under the fame Circumftances I might likc- 
wife make fome fuch Difcovery thro 1 a Metallick Body. 
Accordingly I caufed a Glafs Hemifphere to be made ve- 
ry ftrong : To this Hemifphere I procured another, of 
Burnifti Brafs, exa&ly made, to fall with its Brim about 
an Inch within the Glafs, that I might the better cement 
them together 5 which I did fecurely from any ingrefs 
of the Air in that parr. Thus, when joined, it became 
nearly a Globe $ only the Diameter thro’ its Axis y was 
fome what more than its tranfverfe Diameter, which was 
a difad vantage to its Strength, as the fequel of this re- 
lation will difeover. In this manner I exhaufted all its 
Air, as leaft nearly fo, and then put it on the Machine 
to give it a circular Motion, as ufual in fuch Experi- 
ments. I applyed my Hand to the Brafs Hemifphere in 
Motion, but no Light could be difeover’d within : 1 then 
rubb’d it with a Deal Stick, but the fuccefs was the 
fame. Afterwards I applied a piece of Sealing Wax, 
which has in itfelf a very Electrical Quality : This Wax, 
rubbing roughly on the Brafs, feem'd to (hake the Parts 
of it s neverthclefs there did not any the leaft glimpfe 
of Light appear I then held the Flame of a Candle ro 
the Brafs in Motion, which fomething more than warm’d 
a 
