366 
| l 
fier Fri ao = 
een Dn h ; 19 ien Poh 
tity: MISKENNEN ENC IS — \ == — }. 10u2h —— 
Vie | Dr gh 5 
ar Sir 
v Jt 
may be represented by (, as far as the value is concerned, it is 
Vk 
better not to choose this form: now that we have only to do with 
points in the same volume. If we did so, however, u would have 
to be taken = 1. 
Jut if we wish to judge about the thickness of the segment, 
a . . . 
hence about the value of — —1 at different temperatures or in 
a > 
, 
2 (2 
different volume, the form 2 is necessary. From the form: 
vk 
a UNE 
wight at oh 
a Ul: 
v e . . . . 
we see that only when ——=14, the ordinary value of « is found, 
- Uk 
which can therefore be denoted by aj. At lower temperatures or 
at v << ve we will conclude to the value of u. The original form is: 
l 
r+ 5 
-—1=1 — — 
Vk: 2r 
If we compare the results in the two cases, it appears that the 
quantity which must be subtracted from the righthand side of 1 
ra NS es 
Tg Tg 
is in the first case ae and in the second case ET = ae 
aK le a 27 4 
that consequently for the second case u — $. This result is in agree- 
ment with the observations in by far the most cases. 
l 
: ; sy . 
with | == we find for ether at 0: 
Vie 2r 
4 l 
Ee 
7 Y 
Ot 
A 
l 
or ONS 
