174 BULLETIN 711, U. S. DEPARTMENT OF AGRICULTURE. 
from 12 to 15 gallons of gasoline at a cost of 17 or 18 cents per 
gallon delivered at the engine. From 10 to 15 gallons of water are 
consumed per day. 
This type of engine is also used at one camp for yarding timber 
suitable for piling, and boom sticks from areas that have been 
logged once. Yarding is successfully done at a distance of from 
1,000 to 1,500 feet. Three boom sticks, with 22-inch tops and 80 feet 
in length, can readily be handled at a trip. It is especially adapted 
for clearing rights of way and stump land, also pile-driver work. 
It was primarily designed for clearing stump land, for which pur- 
pose about 50 are in use. Engines of a smaller horsepower can be 
secured. 
WIRE ROPE. 
The cost of wire rope per thousand feet of loading output is dealt 
with in a general way under " Ground yarding." Ordinarily, the 
amount is small. With the single gin-pole loading method, the 
cost of the main loading and spotting lines per thousand feet is about 
$0.01. In the case of an overhead loading method, where no stand- 
ing line is used, the cost of the main and trip loading lines and the 
spotting line per thousand feet is about $0.03. Where a standing 
line loading method is used, the cost of the loading and spotting 
lines per thousand feet ranges from $0.03 to $0.06, depending on 
the distance between the spar trees. 
BLOCKS, HOOKS, TONGS, CARRIAGES, AND OTHER MISCELLANEOUS LOADING 
EQUIPMENT. 
The maintenance and replacement cost of blocks, hooks, tongs, 
carriages, and other miscellaneous equipment per thousand feet de- 
pends on the loading method used. It ranges from $0.01 to $0.08. 
FUEL. 
The cost of fuel for logging engines is discussed in a general way 
under " Ground yarding." A loading engine burns between six and 
seven hundred feet of wood, or about four barrels of fuel oil per day. 
LUBRICANTS. 
The cost of lubricants used in loading is about $0,006 per thousand 
feet of output. 
MAINTENANCE. 
The maintenance of a loading engine costs about $150 per year, 
this amount being about equally divided between labor and new 
parts, material, etc. 
