Jg8 ttJMlNOTJS BLECTtaCITV, 



tervaloF lime, I now prefent them to the reader from my notes, 



and the Iketcii then ruarie. 

 Three appear- Sept. 1 9, 1 7 87 . A frnall ball in the ftate of eledlriqity called 

 '*"r"j°L ^? *'^'^" poi'iiive, threw out flaAies or ramified fparks; and when the in- 



trihed ball. It ^ ' . , , . 



gives flaibcs; is tenfity was encrcafecl, the ball illeU became luminous, at the 

 then luminous, j-^^^e tj^jg emitting the flaftics. When the eleclricity was 



jnd tlien gives „,, . , ■ > , n n r j i -ii- 



fld/he^ofano- itiH more (trongly excile<l the flalnes cealed, and a circle ct 

 iher kind. light, extending about 43 degrees round the point fartheft from 



the ftem, was feen on the ball, and a lirong wind proceeded 

 from it. 

 Experiment with ^ ball of one inch and a half diameter was ufcd ; and elec- 

 diametcr. tricity communicated by n>eans of a cylinder nine inches dia- 



meter, having its cuftiion eight inches long. The excitation 

 was firong enough, by flow turning with a fingle wincb, to 

 throw out large t>ru{lies of light. When the rotation was 

 quicker, the flaflies difappeared, and the circle of light was 

 teen, having a bright (peck moving irregularly round in its 

 Drfrfipiion. periphery. Quicker turning threw out brufhes of light very 

 different from the others : Thefe were lefs luminous in the 

 branches; many ftarted out at once with a hoarfe foungJ. They 

 were greeniQi at the point or fur face of the ball, reddilh in 

 tlie ftem, and ramified fooner. Haifa dozen were fometimes 

 feen flalhing out at once. 

 Experiment with A ball of four tenths of an inch in diameter was ufed. Mo- 

 Ln"^ It'^b'ecame '^^^^^^ excitation produced a denfe brufh of light about two 

 luminous, and inches in length. Wiih flronger eleftricity tlie brulh difap- 

 aftedlikea peared, and the upper half of the ball became luminous. 

 When the excitation was Hill ftronger, more than half of the 

 ball was luminous, as reprefented fig. 3, Plate I. and fome- 

 times a ramified flafli llruck out from the top. Other flaflies 

 were fometimes feenfldevvays when theele6lricily wasftrongeft 

 of all ; but this happened feldom. 



The light was faint, and feemed to be about twice the dia- 

 meter of the ball. It extended more than half way down, and 

 fpread moft fideways. 

 A large ball 2^ When a larger ball of two and a half inch diameter was 

 inch. diam. ^j-gj^ ^^^^ brufhes of light flew out from three or four ftems 

 together to the length of about fix or feven inches, making 

 a hoarfe nolle; but they could not be made to difappear, 

 tliough they feemed now and then to ceafe for a moment when 

 Uie turning was moft vigorous, 



5 The 



