16 
BULLETIN 129, TJ. S. DEPARTMENT OF AGRICULTURE. 
high, carbon content or high crushing strength is required it might 
not be suitable. 
The yields of tar are also somewhat higher than those usually 
obtained in practice, and this can not be explained entirely by the 
low maximum temperature of distillation, since further distillation 
of the charcoal at higher temperatures gave increased production of 
tar. (See p. 4.) It is probable, however, that under the experi- 
mental conditions of distillation there was less tar decomposed into 
gas and coke than under commercial conditions where part of the 
tar would be subjected to considerably higher temperatures after 
formation. 
Table 9. — Average yields per cord of pyroligneous acid, charcoal, and tar from various 
species. 1 
PYROLIGNEOUS ACID (MINUS MOISTURE). 
Species. 
Locality. 
Heart- 
wood. 
Slab 
wood. 
Lum- 
ber. 
Mean 
heart- 
wood 
and 
slab 
wood. 
Aver- 
age 
lumber 
and 
heart- 
wood. 
Other forms. 
Lbs. 
1,062 
1,180 
1,152 
1,249 
1,120 
1,125 
1,098 
790 
Lbs. 
1,165 
1,158 
1,159 
1,135 
1,061 
1, 164 
917 
644 
Lbs. 
1,119 
"i,220" 
'"i,"207* 
"i,"495" 
1,275 
Lbs. 
1,113 
1,169 
1,156 
1,192 
1,145 
1,145 
1,005 
716 
"i,'2oo" 
1, 135 
1,073 
Lbs. 
1,085 
"i,"i67 _ 
"i,"i57" 
"i, 495 
1,156 
Lbs. 
Sap wood.. 1,149 
Do 
Pennsylvania 
Wisconsin 
Birch 
Do. 
Pennsylvania 
Wisconsin 
Pennsylvania 
Maple 
Do . 
* 
Chestnut^ .. 
New Jersey 
do 
1,230 
1,155 
1,081 
1,170 
1,120 
1,065 
Do 
Tupelo 
Limbs 1,049 
CHARCOAL. 
1,417 
1,335 
1,315 
1,228 
1,341 
1,352 
1,058 
1,041 
1,297 
1,383 
1,284 
1,300 
1,515 
1,268 
1,360 
1,160 
1,385 
"i*286" 
"i,'348" 
*"i,"500" 
1,625 
1,357 
1,359 
1,300 
1,265 
1,344 
1,310 
1,210 
1,102 
"1,875" 
1,654 
1,402 
1,403 
"1,303" 
"1,430" 
'"i'soo" 
1,715 
Sapwood. 
Limbs... 
Limbs 
1,470 
Do 
Birch 
Pennsylvania 
Wisconsin 
Do 
Maple 
Do 
Red gum 
Chestnut 
Hickorv 
Pennsylvania 
Wisconsin 
Pennsylvania 
Missouri 
New Jersey 
Indiana 
1,061 
White oak 
Do 
do 
Arkansas 
1,858 
1,580 
1,400 
1,892 
1,734 
1,405 
Tupelo 
Missouri 
. 1,320 
TOTAL TAR. 
Beech 
319 
299 
325 
426 
418 
422 
336 
102 
349 
359 
285 
347 
310 
416 
215 
80 
342 
"""33S' 
"'hob' 
"519" 
331 
332 
329 
307 
385 
450 
418 
276 
91 
""263" 
338 
364 
329 
""o30" 
3ao" 
"""5i9* 
2S5 
Sapwood . . 
Limbs. . .. 
Limbs 
f 
250 
Do 
Birch 
Pennsylvania 
Wisconsin 
Do 
Maple 
Penns3v T lvania 
Wisconsin 
Do 
Red gum 
Pennsylvania 
Missouri 
Chestnut 
Hickorv 
New Jersey 
Indiana 
173 
White bak 
do 
237 
349 
348 
173 
327 
370 
Do 
Tunelo 
Missouri 
447 
The weights per cord were derived as explained on p. 6. 
WASHINGTON : GOVERNMENT PRINTING OFFICE ; 1914 
