]?.'—2

11

TABLE H. INSULATION TESTS of the COOK STRAIT CABLE for the Years ended 30th June, 1868, 1869, 1870, 1871, 1872, 1873, 1874, 1875, 1876, and 1877 respectively, showing the Resistance per knot after Two Minutes' Electrification in Megohms (British Association Units of Resistance).

TABLE I. INSULATION TESTS of SECOND COOK STRAIT CABLE for the Year ended 30th June, 1877, showing the Resistance per knot after two Minutes' Electrification in Megohms (British Association Units of Resistance). LENGTH of CABLE LAID — 44.315 KNOTS.

Date. No. 1 Wire. No. 2 Wire. No. 3 Wire. Date. No. 1 Wire. No. 2 Wire. No. 3 Wire. Date. No. 1 Wire. No. 2 Wire. No. 3 Wire. Date. No. 1 Wire. No. 2 Wire. No. 3 Wire. Date. No. 1 Wire. No. 2 Wire. No. 3 Wire. Date. No. 1 Wire. No. 2 Wire. No. 3 Wire. I I I I I 1867— Sept. 1 Sept. 30 Oct. 14 Nov. 1 Nov. 14 Dec. 2 473 634 547 598 574 608 71 102 179 32-6 106 10-5 534 634 620 667 643 709 1869— Nov. 8 Dec. 3 582 638 5 25 1,253 1,159 1871— April 24 May 23 June 24 Julyt ... Aug. 25 Sept. 25 Oct.f ... Nov. 23 Dec. 28 508 489 717 1-85 2-08 1-28 1,003 955 1,288 1872— Not. 20 Dec. 30 763 867 208 220 1,556 1,561 1874— May 23 June 27 July 24 Aug. 29 Sept. 24 Oct. 26 Nov. 24 Dee. 23 1875— Jan. 23 Feb. 23 March 24 April 23 May 22 June 24 July 24 Aug. 24 Sept. 24 Oct. 23 Nov. 24 Dec.J ... 551 607 682 771 643 944 849 650 398-0 96-1 75 '530 69 28 18 84 1,115 1,227 1,365 1,564 1,483 1,928 1,882 1,060 1876— Jan. 30 Feb. 24 March 24 April 24 May 11 May 24 June 26 July 24 Aug. 21 Sept. 25 Oct. 24 Nov. 24 Dec. 23 291 407 445 355 308 407 333 398 354 380 575 620 370 •649 2-886 •623 •154 •385 •736 •199 •178 •166 •274 3-095 •151 •357 584 680 715 436 379 524 416 493 490 475 843 786 460 1868— June 7* Sept. 11 Sept. 17 1869— March 27 April 19 May 11 May 17 June 22 July 27 Aug. 24 Sept. 27 Oct.f ... 930 630 697 5-5 225 635 1,094 946 1,000 1870— Jan. 22 Feb. 22 March 18 March 20 April 26 May 31 June 26 July 16 Aug. 16 Sept. 17 Oct. 20 Nov. 21 Dec. 21 526 417 442 344 430 456 355 517 473 508 471 505 480 2 3 3-4 3-06 86 •446 23 ■393 1-7 8-7 5-5 10-2 77 865 707 967 G19 812 871 622 893 763 1,108 1,069 1,149 1,121 1872— Jan. 27 Feb. 27 March 31 April 25 May 28 June 22 July 23 Aug. 19 Sept.t ... Oct. 22 751 517 641 570 1-36 1-31 265 998 1,444 1,123 1,481 1,079 1873— Jan. 24 Feb. 24 March 25 April 23 May 23 June 23 July 24 Aug. 23 Sept. 23 Oct. 21 Nov. 22 Dec. 24 642 578 611 585 505 611 628 717 609 569 695 554 103 181 24-8 21-0 29-7 50-0 61-3 68-3 57-2 1821 34,7-5 389'5 1,307 1,271 1,420 1,272 1,231 1,203 1,159 1,564 1,193 1,214 1,429 1,312 883 764 719 636 712 562 749 679 812 602 622 94 44 30-4 37 -G 41-7 41-9 165161" 187205" 1,695 1,274 1,277 1,139 1,274 1,064 1,453 1,251 1,781 1,264 1,391 467 483 562 531 522 649 667 754 26 30 31 14 15 9 7 13 729 748 950 963 931 1,104 1,200 1,275 579 596 676 553 649 687 826 818 8-29 9.5 185 391 44-4 496 056 88-5 981 1,073 938 979 1,173 1.116 1,476 1,735 1877— Jan. 24 Feb. 24 March 24 April 24 May 24 June 23 313 347 584 379 363 396 ■130 •365 ■826 •313 ■222 •211 3G0 418 717 545 386 432 1871— Jan. 21 Feb. 21 March 23 574 565 497 6-7 20 239 1,312 1,173 1,166 1874— J:m. 24 Feb. 24 March 25 April 24 592 551 559 579 3143 280-7 371-5 356-4 1,43S 1,217 1,106 1,303 709 173 1,331 ... ... ... ... * This t« ist was taken ■ith zinc to earth; all the other3 with copper to em th. f No tests taken. t Cable broken.

Dielectric Resistance per Knot. Copper Resistance per Knot in Ohms. Inductive Capacity per Knot in Microfarads. Date. Remarks. Five Cells. Fifty Cells. 1877 — March April May June 12 24 24 24 23 3,341 4,000 2,870 2,141 2,857 2,347 2,674 11-5085 ■3385 •3351 First test taken immediately after laj'ing. 2,689