340 LOGGING 
Dudley. — Formerly when it was not possible to build a straight 
track, and the length of incline exceeded 1^ miles, a special form of 
traction device, called a "Dudley" or "Dudler," was used. It 
was made to operate on ascending or descending grades and 
either to drag logs over the ties or to haul them on cars. 
The Dudley was a traction device with steam or gasoline 
power mounted on trucks. It was moved along the track by 
means of a cable wound several times around a bull drmn on the 
machine. The cable was stationary and the ends were attached 
to stumps or trees at the upper and lower terminals. When 
the drum was rotated the machine warped itself up or down the 
incline. Such devices are rarely used today, some form of one- 
way or counterbalanced incline being substituted for it. 
BIBLIOGRAPHICAL NOTE TO CHAPTER XIX 
Badgett, C. S.: Equipment for Incline Logging. American Lumber- 
man, Oct. 8, 1921, p. 54. 
Clark, A. W.: Overcoming Grades too Steep for Geared Locomotives. 
The Timberman, August, 1909, p. 33. 
Holmes, H. P.: Lowering Logs on Steep Grades. The Timberman, 
Sept., 1914, pp. 65 and 66. 
MacLafferty.,T. H.: Handhng Logging Trains on Excessive Grades. The 
Timberman, July, 1911, p. 44. 
McGiLLicuDDY, B. H.: Lowering Systems versus Switchbacks. The 
Timberman, Nov. 1921, pp. 48 and 49. 
Nestos, R. R.: Aerial Snubbing Device. The Timberman, August, 1912, 
p. 49. 
O'GoRMAN, J. S.: Logging Steep Ground with Inchnes. The Timberman, 
Nov. 1921, pp. 46 and 47. 
Paulsen, E. M.: Inclines versus Swing Machines. The Timberman, 
March, 1922, p. 57. 
Potter, E. O.; Utilization of the Cable Locomotive. The Timberman, 
August, 1909, p. 34. 
Sessoms, H. W. : Proposed Plan for Steep Hillside Logging. The Timber- 
man, Oct. 1913, pp. 74 and 75. 
Sessoms, H. W.: Lowering Logs on Steep Grades. The Timberman, Sept., 
1914, pp. 32 and 32A. 
Sessoms, H. W.: Lowering Systems and Inclines. The Timberman, Nov., 
1922, pp. 72, 74 and 76. 
Wextworth, G. K. : Lowering Logs on a 3200-foot Incline. The Timber- 
man, August, 1909, p. 34. 
Williams, Asa S. : Logging by Steam. Forestry Quarterly, Vol. VI, pp. 
19-21. 
