TS BULLETIN 711. U. S. DEPARTMENT OF AGRICULTURE. 
i a i A 10 by 11 inch compound-geared, high-speed yarding engine of any 
standard make to be used in yarding timber on practically flat ground 
where the yarding distance does not exceed 1,000 feet, the difference in eleva- 
tion over the yarding area does not exceed 75 feet, and the volume of the 
largest logs does not exceed 1,000 feet. 
(?>) An 11 by 13 inch compound-geared, high-speed yarding engine of any 
standard make to be used in yarding timber on rolling ground where the 
yarding distance does not exceed 1,000 feet, the difference in elevation over 
the yarding area does not exceed 150 feet, and the volume of the largest logs 
does not exceed 5.000 feet. 
(c) A 12 by 14 inch compound-geared yarding engine of any standard make 
to be used where conditions are more severe than those stated above. 
(d) The engines to be equipped with high-pressure boilers of large capacity 
and three drums. 
The following give- the -izes of engines used in several camps: 
(a) Compound-geared 11 by 13 inch yarding engines are used. 
They are new. and equipped with the extended fire box. The log- 
ging superintendent is considered one of the most efficient on the 
coast. The country is mountainous, rough, and badly broken up. 
The slopes in general are steep. Logs were moved both uphill and 
downhill: uphill when possible. They averaged about 2.000 feet 
in volume, and logs containing from 7.000 to 3.000 feet were not 
uncommon. 
(b) Compound-geared 10 by 11 inch yarding engines were used. 
They were new. and had extended fire boxes. The ground was quite 
flat, regular, and relatively free of brush and down timber. The 
log- averaged about 600 feet in volume. Never less than two. some- 
times three, and occassionally four logs were yarded at a trip. 
(c) Compound-geared 10J by 10J inch yarding engines were used. 
The timber was second growth, dense, and of fair height, averaging 
about 30 inches D. B. H. The logs averaged about 600 feet in vol- 
ume. The ground was practically level and quite free of ravine-, 
pot holes, brush, and down timber. 
(d) Compound-geared 12 by 12 inch yarding engines were used. 
The country was mountainous and badly broken up. being considered 
a hard chance. The logs, including cedar slabs, averaged 1.200 feet 
in volume, but logs ranging from 5.000 to 7.000 feet in volume were 
not uncommon. 
(e) Small engines are being replaced by high-speed. 11 by 13 inch 
compound-geared engines. The country is rough, the logs averaging 
1.000 feet in volume. Some of the logs scale 5,000 feet. 
The prices of logging engines are given in the following table-. 
They are those of March. 1916. The prices given do not include 
fair-leaders, loading or straw-line drums, the extended fire box. or 
other special devices. 
