76 
SIR WILLIAM THOMSON ON THE 
Table II.—Wrought Nickel Bar. Lower end a true South Pole. 
Operations. 
Magnetometer 
readings. 
Differences. 
Total 
magnetization. 
Bar placed in position . 
Zero 460 
450 
-10 
+ 10 
146 lbs. on ... 
421 
-29 
+ 39 
off ... . 
411 
-10 
+ 49 
„ on ... 
416 
+ 5 
+ 44 
,, off ... . 
410 
- 6 
+ 50 
Clamp liere slipped. 
Bar reclamped and replaced 
in position. 
Image at 
415 
— 45 
+ 95 
146 lbs. on ... 
412 
- 3 
+ 98 
off ... 
393 
-19 
+ 117 
„ on ... . 
410 
+ 17 
+ 100 
,, off ... . 
389 
-21 
+ 121 
10 “ ons ” and “ offs ” 
387 
_ 2 
+ 123 
146 lbs. on ... 
410 
+ 23 
+ 100 
off ... . 
388 
—22 
+ 122 
174 lbs. on . . . . 
408 
+ 20 
+ 102 
„ off ... . 
384 
-24 
+ 126 
10 “ ons ” and “ offs ” 
383 
- 1 
+ 127 
174 lbs. on ... 
405 
+ 22 
+ 105 
„ off ... . 
380 
-25 
+ 130 
211 lbs. on ... 
405 
+ 25 
+ 105 
„ off ... . 
376 
— 29 
+ 134 
10 “ ons ” and “ offs ” 
375 
- 1 
+ 135 
211 lbs. on ... . 
403 
+ 28 
+ 107 
„ off ... . 
378 
-25 
+ 132 
249 lbs. on ... 
403 
+ 25 
+ 107 
„ off ... . 
368 
-35 
+ 142 
10 “ ons ” and “ offs ” 
375 
+ 7 
+ 135 
249 lbs. on ... 
395 
+ 20 
+ 110 
„ off ... . 
365 
-30 
+ 140 
» on ... . 
398 
+ 33 
+ 107 
„ off ... . 
364 
-34 
+ 141 
287 lbs. on ... 
397 
+ 33 
+ 108 
„ off ... . 
357 
-40 
+ 148 
10 “ ons ” and “ offs ” 
353 
- 4 
+ 152 
287 lbs. on . . . . 
393 
+ 40 
+ 112 
„ off ... . 
350 
-43 
+ 155 
