138 Method of increasing Shocks, &c. | 
joints, throughout its length. .The separate lengths of 55 feet are 
cut from single sheets of copper. This is easily done by cutting the 
alternate strips within balf an inch to the edge of the sheet, and then 
bending them one upon the other, to bring them in the same line of 
length; in this way the integrity of the circuit is better preserved 
an by numerous solderings. The ribbon is wound with single 
strips of list intervening. On five of the coils at distances indicated 
by the figure, are soldered strips of copper which pass through the 
cover of the box and are then bent down to receive the thimbles for 
the mercury. This forms a convenient arrangement, as the mercury 
cups are easily emptied by straightening the copper strips. 4, re 
resents the copper tube with a curved strip of copper soldered to its 
extremity for dipping into the mercury cups. For the sake of brev- 
ity in detailing the experiments, instead of the copper tube of right 
or left hand, merely the words right and left hand will be used; and 
by the abbreviations, neg. con. and pos. con. will be understood the 
strips of copper connecting the cups with the negative and positive 
cups of the calorimotor. 
On putting the pos. con. into cup 1 and the neg. con. into cup 2, 
a bright spark and sharp snap are produced, when either of the con- 
nectors is raised from its cup. When the neg. con. is raised from 
cup 3, the spark is more brilliant than the last, iiss with a 
louder snap. 
When the neg. con. is raised from cup 4, the spark i is more ae 
minous, but not so intense as the last named, nor is the snap so Joud. _ 
When the neg. con. is raised from cup 5, the spark is sal less 
bright, and the snap less loud. 
When. the neg. con. is raised from cup 6, (220 feet,) rs spark 
and'snap are both feeble, even when compared with those given by 
cup 3. It would seem then from these results, that the limit®* of in- 
tensity is attained at cup 4, which gives a length of 110 feet; but 
this inference is somewhat weakened by the following facts. The 
shocks by no means obey the same law; the maximum being obtain- 
ed by immersing the copper tubes in cups 6 and 1. For conven- 
ience of arrangement, suppose the positive connector is in cup 1] and 
the right hand in cup 1, The left hand is to pass along with the. 
neg. con. into cups 2, 3, 4, 5 and 6, and as the con. is raised from 
these cups successively, the shock increases, and from cup 6, isa 
ie, ee : 
* ld ely ascertained by having cups on each coil. 
