664 PROFESSOR THOMSON ON THE ELECTRO-DYNAMIC QUAIATIES OF METALS. 
38. Conductor composed of thirteen slips of sheet copper. 
Experiment 1. October 28th, 1853. 
(Current six times six minutes in each direc- 
Augmentations 
tion.) Differences of temperatures after 
of differences 
six minutes of current entering 
from middles to 
\ 
By end next A. 
By end next B. 
ends of periods. 
: Periods. 
Ta-Tb = D. 
Ta-Tb = D'. 
D'-D. 
I. 
QO 
2-09 
o 
o • 
1 
11. 
2*07 
2-10 
-03 
; III. 
2*15 
2-11 
— •04 
! IV. 
2-16 
2-13 
~*03 
' V. 
2*01 
1*99 
—•02 
VI. 
1*80 
2-02 
•22 
I Means for five periods.. 
2-038 
2-070 
•032 
1 
Augmentation of differ-'! 
ence during periods > — *07 
included 
Deduct average augmentation per half- 1 
•007 
period 
Effect due to reversal of current 
... 0°-039, 
in favour of Vitreous Electricity. 
Experiment 11. November 2nd, 1853. 
(Current eight times 
six minutes in each direction.) Temperatures and 
Augmentations of 
1 
differences of temperature after six minutes of current entering 
differences from 
middles to ends of 
By end next A. 
By end next B. 
periods. 
Periods. 
Ta- 
Tb- 
Ta-Tb = D. 
Ta- 
Tb- 
Ta-Tb = D'- 
D'-D. 
I. 
53-79 
52-43 
i-36 
54-00 
52-70 
i-30 
O 
-•06 
II. 
53-68 
52-42 
1-26 
53-51 
52-23 
1-28 
•02 
, III. 
53-86 
52-57 
1-29 
53-79 
52-63 
1-16 
-•13 
IV. 
53-90 
52-60 
1-30 
53-99 
52-63 
1-36 
•06 
V. 
54-09 
.52-72 
1-37 
54-05 
52-68 
1-37 
•00 
i VI. 
55-10 
54-00 
1-10 
54-15 
52-86 
1-29 
•19 
VII. 
53-99 
52-80 
1-19 
54-10 
52-80 
1-30 
•11 
j VIII. 
54-00 
52-50 
1-50 
54-00 
52-60 
1-40 
— 10 
Means for seven period> 
54-0886 
52-8014 
1-2871 
53-9414 
52-6329 
1-3086 
•02143 
Augmentation of difference during periods included *10 
Deduct average augmentation per half-period *00714 
Effect due to reversal of current 0°*01429, 
in favour of Vitreous Electricity. 
