cs | 
1864. } Farmparrn on Submarine Telegraph Cables. 639. 
ments on insulation in detail, and therefore, as in the former experiments 
on permeability, a summary of results will suffice. 
Summary or Resvuits, showing approximately the Time required in each for a Loss 
of Charge equivalent to a Fall of the Electrometer Needle of 50°. 
ye a, |#8a |3es] ,88 
RS Y aie a8 ea = Bie ens 
% 8 Description oF Core, Sag |S8su/3o65 ait 
ae Bf, | eS [oS ete a5 
Se Bae |SOPd| sas} fea 
i 10,000 | 4:363 | 282 136..20- 
’ 3 . E s > J * 908 “Ok . . 
3 acts ee ae | 10,000 | 4-363 | 328 | 100. 0 
4,5 Se 10,000 | 4°363 | 405 32.30 
Il. aa 
1°23 0 0 0 6.20 
4 | 10,000 | 4-363 | 24 11.40 
5, 6 4 ae, 10,000 | 4-363 | 48 27 35 
7 Gore aires pelea patil dite 10,000; (4°36) |-0 56 13. 0 
8,9 clearer ie Ne 13,000 | 4:363 | 77 62. 0 
10 10,000 | 4-363 | 120 97. 0 
11, 12, 13 10,000 | 4363 | 170 105. 0 
Til. en 
1,2 Wray’sicore . s . s 0 0 0 | 1,300. 0 
IV. yt 
2 \WOENTE COD. 5s oro. c 0 0 0 411. 0 
Vv. a . . i “l 
2 \ Core impreenated with in- ¢ | 10,000 | 4°363 4 68.30 
3, 4 sulating liquid { 10,000 | 4-363 | 104 44.15 
a 0 0 0 95°30. 
3) 
2, 3 Core of 20 alternate coats | | 19 009 | 4-363 | 121 42.45 
: of gutta-percha and lope RS 
5 SRS ESE cieseaaoeadl 10,000 | 4:363 | 150 118. 0 
6 comp 10.000 | 4°363 | 170 100.50 
Vil. Het 
1 Me 0 0 0 443. 0 
2 \ Core of pure india-rubber { 10,000 | 4-363 | 80 18. 0 
VU ‘ “ 
ne 0 0 0 4.30 
3 10,000 | 4-363 | 264 8:00 
4, 5,6 | cater core 10,000 | 4-363 | 480 me 
7,8 10,000 | 4:363 | 576 3.37 
ag 0 0 0 26. 0. 
2 \ India-rubber core { 3,977 | 1:72 | 390 0. 0 
x. 1 ut 
1 0 0 0 380. 0 
2 | Silver’s india-rubber core 0 0 0 387. 0 
3 0 0 0 382. 0 
