[ *86 ] 
Received February 12, 1 767. 
XIX. Defer iption of an improved Apparatus 
for performing EleElrical Experiments , in 
which the EleElrical Power is increafed . , the 
Operator intirely fecured from receiving any 
any accidental Shocks , and the whole ren- 
dered more convenient for Experiments 
than heretofore : By C. L’Epinafie, F.R.S. 
Read March 12, I, F* i iHE firfl method of improve- 
‘ /0/ ’ ment confifts in lining the in- 
fide of the glals cylinder or globe with the follow- 
ing compofition. 
Take 4 th of Venice turpentine, 1 lb of refin, ilb 
of bee’s wax; boil thefe over a gentle fire, flirring 
them now and then, for about* four hours, at the end 
of wh'idh, ftirr in a quarter of a pound of vermilion : 
then, a little of the mixture being taken out and left 
ro cool, will be hard and brittle j a token that it is fit 
for ufe. Flaying well heated your globe or cylinder, 
pour the melted mixture into it 3 turn the cylinder 
about fo as to fpread it evenly over the infide furface to 
the thicknefs of a fixpence, and let it cool very 
gradually. 
The advantages that refult from this are as follow. 
1 ft. Upon repeated trials I have condantly found, 
that a cylinder thus lined a&ed with much greater 
force 
