116 DE. JOULE ON SOME THBEMO-DYNAMIC PEOEEETEES OF SOLIDS, 
the tree in November, directly before the experiments. I have also inserted m the Table 
Kind of wood, &c. 
Weight 
of rod per 
foot in 
grains. 
Medium of 
communica- 
tion of heat 
between the 
;lass tube and 
the rod. 
Tension in 
pounds. 
Rose wood in the green 1 
171-6 
Water 
f 35 
state, the bark not re- j- 
moved; sp. gr. '638 ... J 
191 
Vine in the green state, 1 
bark not removed J 
116 
Water ...... 
35 
Poplar in the green state, \ 
bark not removed J 
158-6 
Water 
r 35 
\ 40 
Wheat-straw dried before 1 
a fire J 
14-8 
Air 
5-2 
Wheat-straw moistened by 1 
immersion in water ... } 
38-1 
Air 
5-2 
Yottn'g’s modulus of 
Limits of tempera. , Linear expansion 
ture between which or contraction rod, weighmg 1 lb. ^ 
ture ueivvcc which would be : 
Centigrade. 
the experiments 
were made. 
extended unity by 1 lb.! 
tension. 
46 
42 
and 14*53 
and l6 
28*6 and 11*3 
23*2 and 10 
39 and 9 
33*4 and 11 
•000000240 E. 
•000001101 E. 
•000002121 E., 
•000000773 C. 
•000000037 E. 
•000004865 E. 
16-8 and 12-13 -000000329 0. 
3520625 
982978 
81. Cane, like wood cut in tde direction oi gxaixi, o . ^ 
consequence of being moistened. The expansion by heat bemg 
time, it follows that the increment due to moisture is less when taken at a hi,h than 
a low temperature. a r^ioet^ritv of 
82. The following Table records my observations on the expansi . 
paper, leather, and whalebone. The length exposed to thermal influen ce was oo 
Remarks. 
A strip of cardboard one- 
third of an inch broad, 
dried before a fire 
A strip of cardboard one- ' 
third of an inch broad, 
moistened with water, 
which increased its 
length : 5 :%th 
A strip of cardboard one-^ 
third of an inch broad, 
moistened still further, 
which increased its 
length still further. 
wth. 
Cowskin leather dried be- 1 
fore a fire. A narrow strip J 
Cowskin leather moistened \ 
with water J 
Cowskin leather moistened 1 
still further J 
Whalebone, a strip one- 
third of an inch broad. 
Dry 
Whalebone, a strip one- 
third of an inch broad, 
moistened with water . . , 
Veight 
er foot 
grains. 
■ 
Medium of 
communica- 
tion of heat 
between the 
rlass tube and 
he substance. 
Tension in 
pounds. 
Limits of tempera- 
ture between which 
the experiments 
were made. 
linear expansion ^ 
per degree 
Centigrade. 
A'ousg’s modulus of 
elasticity, or length, 
veighing 1 lb. per foot, 
which would be ex- 
tended unity by 1 lb. 
tension. 
35 
Air 
5-2 
39*4 and 9-4 
•000015780 
39-8 
Air 
5-2 
40-3 and 11*5 
•000026520 
! 
47 
Air 
5-2 
39-45 and 12-2 
•000028950 
17-55 
Air 
5-2 
27-77 and 11*5 
•000038720 
227586 
19-95 
Air 
5-2 
29 and 10-47 
•000047116 
167813 
25-8 
Air 
5-2 
24*25 and 9-75 
•000054401 
118642 
r 35 
24*4 and 9-27 
•000052200 
1 1176554 at 10° 
60 
Air 
{to 
24*35 and 9"9 
•000055020 
J 
71-8 
Air 
5-2 
23*7 and 1 1 
•000024270 
