78 BULLETIN 711, U. S. DEPARTMEXT OF AGRICULTURE. 



(a) A 10 by 11 inch compound-geared, high-speed yarding engine of any 

 standard make to be used in yarding timber on practically flat gi-ound 

 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. 



(h) An 11 by l.S 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, 



(fl) The engines to be equipped with high-pressure boilers of large capacity 

 and three drums. 



The following gives the sizes 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 8,000 feet were not 

 uncommon. 



(h) 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 

 logs 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 10-i b}^ 10^ 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 ravines, 

 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 tables. 

 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. 



