646 Mr. nairne’s Account of 
at this end of the tube rather than into the receiver, to 
be fure that the tube might be filled with the vapour 
arifing from the damp leather rather than with the com- 
mon air. The pump and electrical machine were then 
worked as before. 
EXPERIMENT LIX. 
Ele£trical appearances. 
Degrees of exhauf- 
tion according to 
Barom. 
Pear- 
Light began firfl to appear in flafhes, — — 
Light appeared the whole length of the tube in ftrise, 
Light vanifhed fcarce to be feen, — — — 
The pump had now been worked feven minutes. The 
conductor was now removed from the tube, and the 
greateil If r iking diftance was found to be one inch, 
The tube now appeared luminous, but the light wash 
faint and white. The condu&or was then again put 
in contaft with the tube, and the machine worked: > 
the pump was alfo worked for three minutes more, 
but fcarce any light appeared, — — 
gage. 
gage. 
12 
22 
90 
IOO 
148 
20,000 
The conductor was then again removed from the 
tube, and the ftriking diftance was found to be only one 
inch and four-tenths: the tube at the time of ftriking 
was luminous as before, and the light was of the fame 
faint white colour. 
Having lately received from my friend Dr. lind fome 
aether prepared by the ingenious Mr. wolfe, I was very 
defirous to try whether I could produce any confiderable 
; ? degree 
