POWER SKIDDING 253 
The combined yarder and loader weighing from 70 to 80 tons 
is moved about from one point to another on a specially designed 
steel car. Modern electric yarding engines have proved to have a 
logging capacity equal to those using steam power. 
One of the chief advantages which will result from the more 
extensive adoption of electric logging machinery is the great 
reduction in the forest fire hazard. Further, fuel and water are 
not required and the services of a fireman can be dispensed with. 
Power lines can be installed at approximately the cost necessarj^ 
to pipe water to a steam 3'arding engine. 
Those who have experimented with electrical power, state 
that its use should not be attempted unless adequate power is 
available at a reasonable price. 
BIBLIOGRAPHICAL NOTE TO CHAPTER XIV 
Berry, E. J.: Advantages Accruing to the Adoption of Electricity in 
Logging. The Timberman, August, 1912, pp. 32 and 33. 
Clark, E. T.: Pacific Coast Logging. West Coast Lumberman, Ma\- 1, 
1920, pp. 51 to 118. 
Cole, C. 0.: Difficulties Confronting Electric Log Haulage. The Timber- 
man, August, 1912, pp. 36 and 37. 
Dickinson, M. H. : Single Main Cable Logging. The Timberman, Nov., 
1921, pp. 96 C and 96 D. 
Frink, Francis G.: Washington High-Lead. The Timberman. Sept., 
1915, p. 46. 
Gibbons, William H. : Logging in the Douglas Fir Region. U. S. Dept. 
of Agriculture, Bui. No. 711, Washington, 1918. 
Gray, R. E. : Progress in Electric Logging. The Timberman, Nov., 1921, 
pp. 62-64. 
Hine, Thomas W.: UtQity of the Duplex Logging Engine and the Duplex 
System of Yarding. The Timberman, August, 1910, pp. 36 and 37. 
Kalb, Henry A. : Utilization of Compressed Air for Snubbing Logs. The 
Timberman, August, 1912, p. 53. 
McGiFFERT, J. R.: Development of Cableway Skidder. American Lum- 
berman, Oct. 22, 1921, pp. .56 and 57. 
Mereen, J. D.: Substitution of Electricity for Steam in Modern Logging 
Operations. The Timberman, August, 1912, pp. 29 and 30. 
Murray, L. T. : Railroad Construction vs. Donkey Hauls. The Timber- 
man, Nov., 1921, pp. 60 and 61. 
Murray, L. T.: Changes in Types of Donkey Engines. The Timberman, 
Nov., 1922, pp. 50, 52, and 55. 
O'Hearne, James: Wire Rope. The Timberman, Nov., 1922, pp. 40 and 
41. 
Taylor, W. S.: Different Stages in the Evolution of Overhead System of 
Logging. The Timberman, Jan. 1914, pp. 30 and 31. 
