an Induction- Coil by the Aid of Auwiliary Wires. 493 
Experiments were tried with an assister 160 mm. long in 
a closed glass tube 6 mm. in diameter with bulb 10 mm. in 
diameter. Assister distant (XA) 100 mm. 
Spark-gap. 
JOSS See 5 oe ree 79 mm. 
Detached assister in glass tube with point | gs 
30 mm. from the closed end ............ } 
Do. with screen near closedend ............ 95 
Detached assister in same glass tube with | go 
point oma thelend (20.02 )6 see: 2 
Detached assister removed from the glass tube. 105 
An assister 100 mm. long was coated with solid parattn 
for 5 cm. of its length, and gave the following results :— 
Spark-gap. 
Le a0). oe ae re 81 mm. 
Witt aesisherdertcned. ee ee ee 90 
With assister detached, and microscopic punc- ie 
ture in the paratiin at the point .......... ¢ 
With assister detached and puncture 12 mm. | 9. 
ROU POMEPOMASSISLOT. Gc. occ oss cele ees eo 
An experiment on another day with assister of 100 mm. 
covered with paraftin over 7 cm.; distant 100 mm, from A, 
gave :— 
Spark-gap. 
Unassisted ..... eee ae koi a 78 mm. 
2 SE SERIE ELE 9 aes a er 82 
Assister detached (no screen) ........ End j 105 
Assister detached (screen midway).... 7 reg ) 100 
Assister detached (screen near point) .. | esos ] 94 
i 90 
Assister detached (mo screen) ........ Puncture 
Assister detached (screen near point). . closed; .|, 90 
From these experiments it is evident that placing the 
vulcanite screen near the point has almost the same effect as 
completely enclosing one-half of the assister in paraffin. 
An assister of 160 mm. was taken, and 110 mm. of its 
length was placed in a glass bottle 60 mm. in diameter, the 
point of the assister being 20 mm. from the end of the bottle 
and 100 mm. from the spark anode. The results were :— 
Spark-gap. 
Unacsisicdi yee ey. oe cde pane 74 mm. 
With detached assister in the bottle ........ 103 
With detached assister (bottle removed) .... 108 
The same assister embedded in solid paraffin contained in 
a glass tube gave the following results :— 
Spark-gap. 
[Wierd oo a i oe ee 87 mm. 
yg bcs ieee ¢ Distance from anode 60 mm. Ne 
‘i os io sd Distance from anode 40 mm. 138 
: pik Distance from anode 27 mm, 139 
