SLEDS AND SLED-HAULING 
165 
because the speed of loaded sleds can be checked on steep 
pitches by a "snub-line"^ or a "bridle." 
A bridle is a chain passed around a runner in front of the bunk. 
It is put on and removed as circumstances demand. A clevis 
attached under the forward part of a runner sometimes replaces 
it. Bridles can only be used on smooth ground, otherwise the 
chains catch on roots and other obstructions and stop the sled. 
Tail chains, which bind together the rear end of the load, also 
act as impediments and assist in the control of the sleds. Aided 
by any of these devices, teams can go down slopes loaded, up 
which they cannot return with an empty sled.- 
Fig. 43. — A Yarding-sled Road built up on a Curve to prevent the Sleds 
from leaving the Road. Maine. 
Two-sled Roads. — The road system for an operation on which 
the logs are to be transported on two-sleds, comprises a main 
road over which all the traffic passes to the landing, and second- 
ary roads which radiate from it to the skidways. The roads are 
laid out by the camp foreman often without the aid of survey- 
ing instruments, although in recent years, progressive woodsmen 
have adopted a hand level for the determination of grades. 
The main road location is the more important because it is the 
route over which fully loaded sleds pass. These roads often 
1 See Fig. 48. 
2 The general scheme of roads is shown in Fig. 42. 
