84 
Proceedings of the Royal Society 
able I. 
Weight 
(grms.) 
d 
mm. 
Resistance 
(Constant Silver Wire 
= unity). 
500 
102-0 
•8315 
750 
99-8 
•8348 
1000 
99-6 
•8351 
1250 
98-8 
*8363 
1500 
95-8 
•8409 
1750 
91-4 
•8477 
2000 
82-0 
•8623 
2250 
63'0 
•8925 
Table II. 
1285 
60-6 
•8963 
1535 
52-6 
•9094 
1785 
426 
•9260 
2035 
26‘6 
•9531 
2285 
— *6 
10011 
2535 
— 42-2 
1-0791 
Table III. 
873 
4-2 
•9924 
1285 
— 24-6 
1-0453 
1535 
— 48-2 
1 -0909 
2035 
— 121-4 
1-2459 
Table IV. 
1873 
678-6 
*2407 
2873 
676-8 
•2419 
3214 
670-6 
• 2463 * 
4857 
663-0 
•2516 
5171 
659-6 
•2540 
5921 
647-2 
•2629 
6490 
635*0 
•2717 
6964 
623-4 
•2802 
7650 
600-8 
•2971 
8176 
578-8 
•3141 
8307 
567-0 
•3233 
8842 
532-0 
•3515 
* This measurement is marked in my notes as “ inaccurate, owing to an 
error of observation.” 
