82 



AERIAL LOGGING 



load ; recedes to the next empty in the rear, over the rails thereon, by means of a cable ; and removes, 

 that done, the rail on which it stood a moment ago to the car next following in the rear (in the case of 

 the American). 



The American loads a car in 15 minutes with 4,500 feet b. m., attended by one engineer, four hook 

 tenders, and one top loader. It recedes in 1 'A minutes to the next car, ready to load (data by W. B. Mershon, Jr., 

 collected at Bellemont, Arizona). 



(d) Other makes of log loaders are the Russel (Russel Wheel and Foundry Co., Detroit, Mich.), 

 the Fiory (S. Fiory Mfg. Co., Bangor, Pa.), and the Brownhoist. 



The price of an up-to-date log loader ranges between #3,000 and -v 6,000. 



V. The Southern logging superintendents, at a recent meeting, gave the following as the figures, 

 per 1,000 feet b. m., for expenses incurred by their concerns when loading logs on cars:- 



Arkansas from 2r9 to 22 cents ... Louisiana ... from 17 to 58 cents 

 Texas ... from 17'6 to 50 cents ... Mississippi ... from 28 to 31 cents 



PARAGRAPH Xll. 



AERIAL LOGGING. 



The logs are suspended in mid-air from a block carriage travelling on a stationary cable, 

 is propelled by gravity, by steam, or by electricity. 



(A) GRAVITY SYSTEM ON STEEP SLOPES. On a grade of 35 to 50 per cent, the 

 by gravity, suspended from a carriage formed by two trolley blocks held apart by a strong 

 about 15 feet long. At the upper end of the cable, curved iron rails lead, like bridge 

 switches, onto the cable. The cable is kept tight by heavy drums, over which the ends 

 of the cable are wound. The speed of the double block carriage is regulated by manila 

 rope, wire, or light wire cable, and the empty block carriage is carried backward by 

 the same rope without any motive power other than that of a loaded 

 block carriage going down hill. Proper switches allow the empty block 

 carriage to pass thq loaded one at a halfway point. 



1. In Switzerland, lines two miles long are found, without any supports, 

 in the Hartz Mountains, sup- 

 ports are given every 700 

 feet and the expense is -^800 

 per mile for entire equipment. 



2. In West Virginia and West- 

 ern North Carolina, short 

 cable conduits of this char- 

 acter are in successful use, 

 and in India (in the Hima- 

 layas), the most extensive 

 plants of this character are 

 said to exist. 



3. A gravity cable way system, 

 near Hood River, Oregon, 

 is intended to deliver large 

 quantities of logs from the 

 brink of a plateau to a mill- 

 pond m a steep abyss, Aerial logging^y gravity on Hood River, Oregon. 



The carriage 



logs descend 

 rod or pole 



1 



