Periodical Literature. 209 



25 cm. diameter, making the channel 0.7 to 1.2 m. wide, are now 

 for the purpose of saving material, made of slabs from the mill 6 

 m. long and 3 to i cm. thick, which can be done more cheaply, and 

 the saddles are made solid of sawed material. This is more expen- 

 sive, to be sure, but the material can be used over again. This 

 structure is also more cheaply kept in repair. The landing where 

 the logs are ejected is constructed of stout beech planks and iron 

 facinr;."?. 



When constructed of logs, the cost used to be 40 cents per yard 

 (m.) vdthout, and 50 cents with the value of the wood included. 

 Their efficiency is very high, the slides lasting about seven years. 

 Their cost of operation is very low, consisting merely of throwing 

 in the logs and in the amortization of the cost. 



The movable slide is made of trough sections, each consisting of 

 two half-inch boards, 10 to 14 inches wide and 16 to 20 feet long, to 

 be placed on saddles of two poles, set in the ground slanting toward 

 each other and tied together at the top, costing about 40 cents per 

 meter and 4 cents for placing the trough. These are very effective, 

 lasting 3 to 5 years, and by using thin beech boards on the inside 

 may be made to last even longer. 



Neither of these devices, however, was efficient in transporting 

 small firewood. To facilitate this, a combination of the wire-rope 

 and log-slide systems is used. In this wire-rope road a sled-like, 

 solidly constructed carriage moves on a roadv/ay, constructed by lay- 

 ing and fastening leading poles, 4 to 5 inches in diameter, along the 

 inside of the log slide, the cross ties of the sled being cut out so that 

 it must move on the poles. The wire rope, running over two rolls, 

 has a loaded sled at one end, and an empty one at the other end, the 

 velocity of the movement being regulated by a brake. Near the 

 middle of the road the empty sled is switched vertically above the 

 loaded one by running upon a short stretch of higher balanced sled- 

 way, which elevates it above the loaded sled and automatically re- 

 turns it to the slide. This structure has proved itself in all respects 

 superior and can be used either without the sled as a slide for trans- 

 porting logs or with the rope and sled. 



Die Riesen. Schweizerische Zeitschrift fiir Forstwesen. July, 

 August, 1906, p. 217-226. 



