112 
DE. JOTOE ON SOME THEEMO-DYNA.inC PEOPEBTIES OF SOLIDS. 
Remarks. 
Weight of 
rod per 
foot in 
grains. 
Medium of 
communica- 
tion of heat 
between the 
glass tube and 
the rod. 
Young’s modulus of 
Limits of tempera- Linear expansion 
Tension Iture between which or contraction ’ 
! one ID. 
Moistened by immersion in 
water a short time. Ex- 
periment made half an 
hour afterwards 
Moistened further by im-'j 
mersion under water I 
forty hours. Experiment j 
made shortly afterwards J 
Dried before a fire for \ 
twenty hours J 
Immersed in alcohol for 1 
two days J 
After immersion for one 
week in water, sp. gr. 
being then 0'82 
After it was kept warm be- ' 
fore a fire for five days 
in frosty weather it be- 
came electrified on rub- 
bing it with the hand, 
and retained its charge 
a long time 
201 
227 
196 
215 
291 
176 
Mercury . 
Mercury . 
Mercury 
Alcohol 
Water ... 
Mercury 
' 42-27 and 15-2 
42-3 and 16-01 
gl-6 and 10-8 
33 and 13-3 
49-6 and 11-7 
37-33 and 13-4 
40-6 and 12-3 
40-6 and 13-6 
, 31-5 and 12-8 
i 37-05 and 14-72 
'39-3 and 12-7 
1 36-5 and 13-5 
•000002255 E. 
•000004109 E. 
0 
•000000176 E. 
•000000436 E. 
•000001140 E. 
•000004555 E. 
•000005481 E. 
•000002692 E. 
■000003000 E. 
5721154 at 38-2 
6O86956 at 12-4 
7472530 at 13 
•000000388 C. 5948141 at 10-4 
•000000327 E. 5242724 at 37 
39-3 and 11-7 -000004516 E. 
7309582 at 13 
70 Beal —My next experiments were on a rod of St. John s Pine, peifectlj free from 
knot 1 straigL in the^; ^ths of an inch, and the length snh- 
jected to thermal influence 33 inches, as before. 
Remarks as to the condition 
of the wood. 
Dried by remaining before a fire a few | 
Moistened by immersion for a few 
hours in water 
Boiled in water, and then left im- 1 
mersed in cold water- some hours . . . J 
Left immersed in water three days \ 
longer J 
Left several days longer immersed in \ 
water J 
until it could be electrified by rub- 
bing with the hand 
Covered with pitch 
Weight of 
rod per 
foot in 
grains, j 
1 
Proximate i 
specific 
gravity. | 
Medium of 
communica- 
tion of heat 
between the 
glass tube 
and the rod. 
Tension 
in pounds. 
Limits of tempera- 
ture between which 
the experiments 
were made. 
Linear coutrac- 
ion or expansion 
per degree 
Centigrade. 
1 
f 35 
O 
41-7 
and 13-43 
•000004277 E. 
132-4 
1 
Mercury ... 
{ 235 
41-5 
and 15-41 
•000004379 E. 
172 
•557 
Water 
35 
48-7 
and 15-36 
•000000768 E. 
J 35 
41 
and 12-78 
•000000377 C. 
241-2 
•761 
Water 
j 35 
24-5 
and 12*98 
•000000360 C. 
272-4 
•854 
Water 
35 
48-7 
and 14-62 
•000000636 C. 
r 
12-7 
and 2-7 
,-000000235 C. 
, J 
36-4 
and 7’5 
•000000260 C.' 
303-6 
Water 
’40-8 
and 28-8 
1-000000088 E. 
1 
63-6 
and 38-6 
;-000000446 E. 
1 
i 
Air 
35 
37-16 
and 11-57 
•00000434.2 E. 
141-8 
1 
I 
1 
Air 
35 
j32-2 
and lO'Sc 
i-000004030 E. 
71. Deal mt across the gram.-Tlre specimens were cut at right angles to the pores 
of the wood, but obliquely in respect to the concentric rings which indicate the gioiv i 
of the tree. The length subjected to thermal influence was 12 inches. 
