COLD METALS ON LEFT. 
Tance showing the comparative thermo-electric effects obtained with loose and tight contacts between loops of one and two metals, 
foot__ 897, Siemens's mercury units, The numbers entered are deviations observed on a reflecting galvanometer, and are very 
‘Total resistance of circuit in every case about 2048 x 10° absolute da 
nearly proportional to the strengths of currents, 
Tron, 
Tron. 
seconds 
Siver. 
HOT METALS ON RIGHT (except when words “in middle” are used). 
(10 face page 177. 
PLATINUM. 
Gop. 
Copper, 
Heated at right side, 
Loose contact 2=»——>— 10 
Tight contact s»——>-2 
Heated in middle. 
Maximum 
Heated at right side, 
Loose contact s=-——>— 12 
Tight contact 21 
Heated in middle, 
Ist maximum —<——eme 2 
2nd do. (hotter) »=»——>-5 
Heated at right side, 
Loose contact 2»——>10 or 15 
Tight contact <——ewe 10 
Heated in middle. 
Maximum —<——_e« 10 
land do.(hotter) ==> 4 
Heated at right side, 
Loose contact 2»——>- 15 
Tight contact »=»——>2 
Heated in middle. 
Ist maximum —<——eme 4 
Heated at right side, 
Loose contact —<——eme 100 
Tight contact 2==——s—weak 
Heated in middle. 
1st maximum ~<——eue 3 
2nd do. (hotter) s»-——=- 3 
SrLver. 
2nd do.(hotter) —<——eme 5 
Heated at right side. 
Loose contact »»——>—8 
Tight contact 2==——>weak 
Heated in middle. 
Ist maximum 2=»—>—2 
Heated at right side. 
Loose contact 2=»——>—weak 
Tight contact 2=»——>weak 
Heated in middle, 
Maximum 
Heated at right side. 
Loose contact ~<——«me 100 to 150 
Tight contact <——euac 10 
Heated in middle, 
Maximum es 12 
Heated at right side. 
Loose contact —<<——me 10 
Tight contact ~——eme weak 
Heated in middle. 
Maximum  —<——eme 1 
Maximum 
Heated at right side, 
Loose contact —<——eme 190 
Tight contact <——eme2 
Heated in middle 
2 
<x! 
PLATINUM. 
Goxp. 
Heated at right side, 
Loose contact 3=——>-12 
Tight contact 2=»——>10 
Heated in middle, 
Maximum == 10 
Heated at right side, 
Loose contact #==——>—-15 
Tight contact 2-15 
Heated in middle. 
Maximum z= 12 
Heated at right side, 
Loose contact —<——eme 5 
Tight contact .......... 0 
Heated in middle. 
Maximum oes eee 0 
Heated at right side. 
Loose contact 2=»——>~10 
Tight contact s=»——>10 
Heated in middle, 
Maximum 210 
Maximum 
Heated at right side. 
Loose contact 2=——> 15 to 20) 
Tight contact 2»——>weak 
Heated in middle. 
lst maximum 2=— 3. 
2nd do.(hotter) <——eme 4 
Copper. 
Heated at right side. 
Loose contact —<<——eme 90 
Tight contact 2» weak 
Heated in middle, 
Ist maxinum 2=»—>-3 
2nd do. (hotter) <———eme 3 
Heated at right side, 
Loose contact 2=——>— 10 
| Tight contact 2=»——s—weak 
Heated in middle, 
Maximum 2—>2 
Heated at right side. 
Loose contact —«——eme 5 
Tight contact ~<——eme 10 
Heated in middle, 
Maximum —<—_—_e 10 
Heated at right side. 
Loose contact —<——me weak 
Tight contact »=»——>weak 
Heated in middle. 
Maximum 
Maximum 
Heated at right side. 
Loose contact —<——eme 170 
Tight contact ———eme weak 
Heated at right side. 
Loose contact ~<——eme 80 
Tight contact 2=»——> 10 
Heated in middle. 
a—=—15 
Heated in middle. 
weak 
Heated at right side. 
Loose contact <——eume 210 
Tight contact 2=»-——>weak 
Heated in middle, 
Maximum  2=»——>-2 
Heated at right side. 
Loose contact —<——me 250 
Tight contact ~<——me uncertain 
Heated in middle, 
Maximum —<—_ee 15 
Heated at right side. 
Loose contact ~<——me 280 to 300, 
Tight contact me weak 
Heated in middle, 
Maximum  —~<——eme weak 
Maximum 
Heated at right side, 
Loose contact <——eume 220 
Tight contact ~-——eee weak 
Heated in middle, 
saw ean tie 0 
| 
ON TH 
Heat,’ tha 
clusively 
ossibly gi 
Theless If 
is maintai 
the two en 
recommen 
the hot on 
wires does 
siderable ¢ 
perature. 
that wires 
they have 
the conduc 
when kept 
some may 
suppositior 
the theory 
Another 
in a partia 
by the sud 
between a 
with the c 
does not 5' 
Tan, hi 
next year 
theories is 
experimen 
Dr. Matthi 
electrical y 
presence of 
The nan 
side and to 
entered in 
columns ¢ 
formed the 
show the d 
subdivision 
heated and 
deflection 
together. 
The thir 
current, wh 
held tightly 
The fom 
current in t 
last entries 
The first en 
an uncertail 
An exam 
1862, 
