108 
STRUCTURE OF WOOD, &C. 
Results of Heat developed in the Combustion of Birch-wood. 
combustion as 
I 
Result, 
wi th the heatdevelop- 
1 
tn combustion of lib. 
of combustible. 
No. ofQuan- 
Heat 
lb. of 
lb. of 
the 
tity of 
com- 
water 
water 
experi- 
wood 
muni- 
heated at 
at the 
ments. 
con- 
cated 
1° of Fah- 
tempera- 
ture of 
is tuned* 
to the 
renheit’s 
colori- 
thermo- 
melting 
meter. 
meter. 1 
ice, 
thrown 
into ebul- 
lition. 
gram. 
Deg. 
Fire-wood, 2 years old... 
1 
5* 
1 oi> 
8§S 
5875 
$ 32*445 
\ 32*841 
2 
4* 
Shavings dried in the air.. 
3 
4 
4*55 
4 54 
m) 
ms 
6261 
\ 34*805 
( 34*88 1 
Shavings highly dried \ 
ovpr a chafing-dish.. $ 
5 
6 
7 
3*97 
2-58 
4-97 
i° ) 
GK 
1 I 1 
7002 
(38*916 
<48*925 
(38*858 
1 1 ) 
Shavings highly dried 5 
) 
and scorched in a> 
stove. . \ 
8 
5*07 
10H 
5614 
f 31*325 
9 
5*10 
10*) 
LSI-052 
Shavings scorched, but 5 
not to so high a> 
10 
4*89 
10* 
5971 
33*174 
desnee ) 
Remarks. On comparing the results of these six experiments, all made 
with the same kind of wood, in their shavings, it will appear that 
the drier the wood, the greater was the quantity of heat pro- 
duced from a given weight of shavings. But I found, in taking 
account of the quantities of moisture contained in the woods, 
the quantities of heat were always sensibly proportional ta 
those of the dry wood burned 5 with the exception, however, of 
the three latter experiments, which were made with wood 
highly dried for 24 hours in a stove, and which gave several 
indications, by no means equivocal, of the beginning of a 
decomposition. 
The shavings most scorched in the stove, gave less heat than 
those which had been less scorched) the two sorts being taken in 
equal weights. 
In all these experiments more or less water dripped from the 
worm) acertain proof that some hydrogen had been burned: this 
fact 
