218 BULLETIISr 711^ U. S. DEPAETMENT OF AGKICULTUEE. 



Another incline of this tj-pe was put in operation in Washing- 

 ton in 1914. A brief description of this incline and the method of 

 its operation follow: 



From the sawmill the logging railroad follows a valley for a dis- 

 tance of 2^ miles on a broken grade, the maximum grade being 3J 

 per cent. At the incline end of the railroad there is a 1,600-foot 

 tangent, which breaks into a 21-degree curve. This curve connects 

 with a short stretch of tangent track which forms the foot of the in- 

 cline. At the foot of the incline there is a passing track for the 

 storage of empty cars. This track, being connected with the main line 

 at two points and having a 4 per cent grade, permits the empties to 

 be dropped out on the main line toward the incline by gravity. 



The incline is 5,300 feet long and straight for its entire length. 

 It has a vertical rise of 1,500 feet, the maximum grade being 56 per 

 cent, the minimum 15 per cent. The latter grade occurs at the pass- 

 ing jDoint. 



Starting at the bottom of the incline, there is a single track until 

 the passing point is reached. From this point to the top of the in- 

 cline there is a double track. At the upper end of the incline the 

 tracks are laid 6 feet 8^ inches apart, center to center, except at the 

 passing point in the middle of the incline, where they are 12 feet 

 apart, center to center. This arrangement insures ample clearance 

 for the rope and permits the transportation of camp buildings, log- 

 ging engines, and other equipment, up or down the incline, on cars. 



At the top of the incline there is a gravitj^ siding on which the 

 empties run. ' This siding branches from the incline proper and runs 

 along below the logging road for a short distance before connecting 

 with it. 



The hoisting line passes through sheaves on the top of a tower or 

 headworks set at the top of the incline near the hoisting engine. 

 These sheaves, six in number and set tandem, equalize the strain on 

 the line. The sheaves are not overloaded, each one being calculated 

 to carry a load of 2,000 pounds, one-sixth of the downward pressure 

 of the line at this point. 



The lowering engine is located 350 feet back from the head of the 

 incline and 250 feet from the headworks. It is mounted on a 55-foot 

 sled, which is set level in a pit. A timbered bulkhead is set between 

 the front end of the sled and the dirt wall of the excavation. The 

 runners of the sled, together Avith the hold-down weights for the 

 brakes, are embedded, thus insuring a very substantial setting. 



The hoist consists of a large gypsy drum, equipped with suitable 

 brakes to control the load in its descent, the motive power being fur- 

 nished by 11 by 13 inch engines of the reversible type. It is equipped 

 with two sets of gears, one set having a gear ratio of 5 to 1, the other 

 15 to 1. This arrangement gives a high speed — 900 feet per minute — 



