21

¥.— 1

Table No. 22. Insulation Tests of the First and Second Cook Strait Cables for the Year ended 31st December, 1887, showing the Resistance per Knot after Two Minutes' Electrification in Megohms (British Association Units of Resistance).

Table No. 23. Insulation Tests of the Wanganui and Wakapuaka Cable for the Year ended 31st December, 1887, showing the Resistance per Knot after Ten Minutes' Electrification in Megohms (British Association Units of Resistance). Length of Cable laid, 108-69 Knots.

4—F. 1.

First Cook Strait Cable. No. 1 Wire. No, 2 Wire. No. 3 Wire. Second Cook Strait Cable. Dielectric Resistance per Knot. [anuary 132 149 311 January 444 February 135 148 271 February 406 Vlarch .. 126 J45 259 March 362 129 149 270 April .. 373 Way r43 174 297 May .. 3°3 fune 140 169 289 June .. 295 [uly .. 140 174 282 July .. 282 August .. 150 176 296 August 260 September 146 173 284 September 281 October 149 167 271 October 226 November 132 159 262 November 213 December 134 167 266 December 184

Date. Dielectric Resistance per Knot. Copper Resistance per Knot in Ohms. Mean Temperature of Sea-bottom calculated from the Observed C.R. Twenty Cells. Deg.Fahr. fanuary .. 5>I59 1094 56 February 3.512 II-O 59 March 3,837 11 09 6275 <Vpril 3.920 iro6 6r8 May 5.198 no 59 fune 5>789 11 04 609 [uly 5.3°° 10-95 57 \ugust 3.3CO 1089 54'°i September 8,225 I0'92 55'4 Dctober .. 5.725 10-98 58 November 5.856 io'95 57 December 6,023 10-95 57