0. N. Rood—Nature, etc., of the Discharge of a Leyden Jar. 871 
Art. XLIII.—On the nature and duration of the discharge of a 
Leyden Jar connected with an induction coil; by OapEN N, 
Roop, Prof. of Physics in Columbia College. Part IIT. 
(Concluded.) 
Form and duration of the discharge of the small jar with brass 
alls as electrodes. 
The form of the discharge under these circumstances was 
more complex ; the succession of acts being generally as fol- 
lows: first, an instantaneous spark, which was followed by a 
pale violet discharge, lasting a small fraction of a second ; 
afterward came a series of instantane- 
ous sparks whose number diminished 
as the striking distance became great- 
e; the average of the experiments 
Sarai Oo apne ‘0247 sec. 
nla PEC Ce panes > pees 0276 “ 
Final ws ea SSI a. OS 0261 “ 
The portion AB, figs. 5 and 6, consisted of from ten to 
"twenty instantaneous pace: its duration varying with the 
Di 
number of included discharges. Dise observations gave for 
Maximum duration of AB,............... ‘0119 see. 
Medium “ RE tae at sc. Clue * 
Minimum MN cceeetrs sere 0058 * 
jj ome: .—A quite differant form was some ee a Deen 
ike that in fig. 7, and consisting of a faint violet streak termin- 
at each end by: an instantaneous spark, the Sg aa being, 
026 sec, to 030 sec 
