-4h= 
YIELD OF TURPENTINE AND ROSIN. 7 
figures are 2.8 and 2.9 per thousand, respectively. These trees may 
have died from tapping or from mea | causes. If the dead faces 
were the result of turpentining, it would indicate that standard 
chipping was hardest on the timber, the double next, and the narrow 
easiest. It is logical to assume, however, that double chipping 
would be severer than the standard. Since most of the trees died 
early in the season, it is probable that method of chipping had little 
effect. 
TABLE 5.—Comparative yields per crop with respect to height of face. 
Turpentine. Rosin. 
a Aver- 
m- age 
Plot. Height berof |height | || Per BOO ieee 
streaks. e) ota inc ota inch 
streak.| yield. | of |12°Te@Se-) yield. | of _ | crease. 
height. height. 
Inches. Inches. |Gallons.|Gailons.| Per cent. | Pounds. |Pounds.| Per cent. 
Standarde ss. se. scecee 21.95 38 0.58 | 3,260 1 eas uA © 105 ¥%539)| ANSOSn | peewee ee 
INES ETO Wr ae aer o! 12. 85 38 .34 | 2,693 209 41.2 87,014 | 6,771 40. 8 
DOD OH se ek 23. 67 70 34] 4,267 180 21.6 | 143,542 | 6,064 26. 1 
1 The narrow and double areas had four standard streaks before the experiment started. The height 
of the four streaks averaged 2.75 inches from 25 measurements. With this allowance, the streaks on the 
narrow and double areas y averaged 0.30 and 0.82 inch, respectively. The corrected height for the double 
face is 22.20inches and for the narrow face 11.38 inches. 
PRACTICABILITY OF DOUBLE CHIPPING. 
In the experiments the double chipping was done on exact schedule. 
Certain trees were chipped always on prescribed days of the week, 
except in a few instances when weather interfered. It is very 
improbable that an exact schedule could be maintained on a 50-crop 
place, but for practical purposes this would not be necessary. In 
the experiment the number of faces for double chipping was made 
small enough for the chipper to cover the ground easily on scheduled 
time. In practice each chipper would have about 4,000 faces. 
Since few chippers can handle more than this number in three days, 
it is improbable that the second streak would be applied too soon. 
It is expected that a streak would be missed occasionally, as this 
frequently happens with the present method of chipping. The idea 
is not to have a rigid schedule impossible to follow, but so far as 
possible to make two streaks per week where the old method requires 
one, these two streaks not to increase the height of the face more 
than the one standard streak. In every case, however, at least 
three days should elapse between streaks. 
The chief problem would be to find a sufficient number of chippers. 
The smaller streak is not difficult to cut. More care is required in 
making it, but less effort is required to drive the hack through the 
wood. Sian hal No. 0 or No. 00 hacks were found to give the best 
results. 
