182 FE. H. Hatl—New Action of Magnetism 
or two hundred per cent larger or smaller than the true num- 
ber. All the numbers given must of course be taken as at best 
only rough approximations to the true representative numbers. 
We find t 
Tron — 78° Platinum 2°4 
Silver 8°6 Tin "2 (?) 
Gold 6°8 
This arrangement is made on the basis of defining the magni- 
tude of the action studied as a quantity inversely proportional 
M 
to EO If on the other hand we were to define the same as 
inversely proportional to , rather, EK being the difference 
ik 
of potential of two points a centimeter apart on the longitud- 
inal axis of the metal strip, the representative numbers wou 
be relatively changed. The representative numbers on this 
new basis may be found by Bre bs eile each of the repre- 
sentative numbers given above a quantity proportional to 
the specific electrical resistance of the metal to which the num- 
ber is attache 
We thus obtaii 
Tron — 80: Platinum 2°6 
Silve er 57° Tin "15 (?) 
old 32: 
It will be observed that the order of arrangement remains 
unchanged. 
Platinum and tin are carried still farther from gold and silver 
than before, so that the range of the representative numbers 
is increased. It is plain, therefore, that by this second arrange- 
ment no progress has been made toward finding a constant 
representative quantity for all the metals. In dealing with the 
results obtained with different metals, it seems to be little 
{ X 
importance whether we take as our basis 
5 hg 
When, however, we have to do with different eae of the same 
metal, we see from the experiments on both gold and silver 
that the basis 
* is by far the better one. We may sum 
oF the matter by saying that according to present appearances: 
Ist, there is no ea representative quantity for all metals ; 
2nd, the basis aoe 
quantity for ate ve of the same metal ; 
3rd, the badis 
metal a sg tlacalaitea quantity which is approximately a con- 
stant. 
does not give a constant representative 
gives for different plates of the same 
