LOGGING IN THE DOUGLAS FIR REGION. Ill 
(b) Logging engine, 11 by 13 inch; boiler, 66 by 120 inch, 200- 
pound working pressure, safety valve set at 175 pounds; time, 5 
months ; average daily consumption, 7.8 barrels ; chance, ground was 
extremely rough, requiring at times the use of two lead blocks and 
a stump roller; average log, 1,870 feet; maximum yarding distance, 
1,500 feet; average yarding distance, 750 feet; average output per 
engine per yarding day, 59,400 feet. Cost of fuel oil per barrel 
delivered in tank on rear end of sled, $1.05, or $0,138 per thousand 
feet. It is estimated that had wood been used the fuel cost would 
have amounted to $0,305 per thousand feet, so that $0,167 per thou- 
sand feet was saved by burning oil. 
(c) Logging engine, 11 by 13 inch; boiler, 66 by 120 inch, 200- 
pound working pressure, safety valve set at 185 pounds; time, 29^ 
days; average daily consumption, 8.9 barrels; chance, up-hill yard- 
ing, the maximum lift amounting to 325 feet ; maximum yarding dis- 
tance, 1,200 feet; average yarding distance, 609 feet average output, 
98,700 feet. Cost of oil per barrel delivered in tank on rear end of 
sled, $1.05 per barrel, or $0,089 per thousand feet. It is estimated 
that had wood been used not more than 75,000 feet per day could 
have been yarded and the fuel cost would have amounted to $0,184 
per thousand feet, so that $0,095 per thousand feet was saved by 
burning oil. 
Those who have used coal in their logging engines feel that it has 
a decided advantage over wood. It does not, however, decrease the 
fire risk, neither is it a cheaper fuel than oil; so oil is preferred to 
coal, except in special cases where coal can be bought very cheaply. 
The cost statements of operators do not show the cost of fuel con- 
sumed in logging engines as a separate item, and where wood is used 
the value of the merchantable timber consumed in this way is not 
charged against the cost of the logging. Since purchasers of national 
forest timber pay the same prices for merchantable timber consumed 
as fuel as for timber removed from the sale area, it is obvious that 
the cost of such material should be provided for in timber appraisals. 
Of course, if the character of the timber is such that it is clear that 
ample and satisfactory fuel can be secured from cull logs, the ap- 
praising officer will not make any allowance in his estimate. While 
it costs as much, or more, to deliver a wood log as a merchantable log 
alongside the logging engine, it may not be practicable for an ap- 
praising officer to take care of this cost under the heading " Fuel cost," 
since it can more easily be provided for in the estimated yarding 
output. The labor cost of preparing the wood for fuel can also be 
more easily taken care of under the heading " Yarding cost, labor." 
The amount of sound wood consumed in a yarding engine ranges 
from 1,000 to 1,500 feet per day, depending for the most part on the 
