94 BULLETIN 111, U. S. DEPABTMENT OF AGRICULTURE. 
CASE 3. 
Equipment. Cost. 
12 by 14 inch standard compound-geared yarding engine $5, 000 
Repair parts and materials for yarding engine 220 
Yarding engine sled 450 
Fair-leaders 150 
Extended fire box 250 
Straw drum 150 
Electric signal 100 
Fuel-oil equipment and water tank 450 
Blocks and extra parts _ 675 
Yarding rollers 150 
Ground yarding lines: 1,000 feet of IJ-inch main line; 2,500 feet of |- 
incli trip line ; and 2,500 feet of f-inch straw line 1. 161 
Butt chains, butt hooks, and clevises TO 
Chokers and choker hooks 185 
Miscellaneous equipment 275 
Total cost 9, 286 
Note. — Statement includes equipment in use and in stock. 
COST. 
Output. — Taking it straight through by camps, good and bad 
country, the ground yarding output, naturally the basic element in a 
cost computation, ranges between 40,000 and 80,000 feet per yarding* 
engine per yarding day of 10 hours. A few camps average a little 
less than 40,000, feet, others average more than 80,000. For a short 
period the output may be considerably lower or higher. The largest 
volume of timber ever yarded in a day of 10 hours in this region 
amounted to 432,000 feet. The crew, on its mettle, was working in 
ideal natural conditions and with first-class equipment. A crew 
working in a particularly hard chance may get as little as 100,000 
feet in one week ; in a particularly good chance, as much as 1,000,000 
feet in the same time. 
The estimating of the average output in a given chance or set of 
conditions is extremely difficult and liable to error. It has been esti- 
mated that a yarding engine carrying 900 feet of line should average 
45 logs, or from 67.500 to 90,000 feet per day in timber where the logs 
average from 1.500 to 2,000 feet to the log; 50 logs, or from 50.000 to 
75,000 feet per day in timber where the logs average from 1.000 to 
1,500 feet; 55 logs, or from 27.500 to 55.000 feet per day in timber 
where the logs average from 500 to 1,000 feet: and 65 logs, or about 
30,000 feet per day in timber where the logs average less than 500 
feet. These estimates were based on time records. One hour each 
day was allowed for moving yarding engines: four for the placing of 
chokers, unfastening of logs by the chaser, removing unmerchant- 
able timber from the roads, hauling wood logs, changing lines, etc. : 
