SLEDS AND SLED-HAITLINCx 171 
of which is shown in Fig. 45. The framework is constructed 
of poles 6 or 8 inches in diameter and heavy brush is placed on 
the sides and roof to prevent the entrance of snow. The height 
and width of the sheds is dependent on the size of the sleds and 
the maximum height of loads hauled. 
Screens built from tops and limbs sometimes are placed along 
the windward side of a road to protect it against drifting snow. 
A fringe of trees also may be left along exposed portions of the 
road, this timber being cut during the last season the road is 
used. 
Two-sled snow roads require at least from 8 to 12 inches of 
snow for successful operation and in the Lake States and the 
Northeast conditions are seldom favorable for their use until the 
middle or latter part of December. Hauling begins at this time 
and continues without interruption until all of the logs are on the 
landing, or until the season breaks up and the snow leaves the 
roads. 
Snowplows play an important part in the maintenance of a 
main two-sled road. They are frequently made by the camp 
blacksmith, but also are sold by dealers in logging supplies. 
Plows are used after each snowfall to clear a right-of-way along 
the road wide enough to permit loaded sleds to pass. They 
are built in several patterns, a common one having V-shaped 
flaring sides from 2 to 4 feet high, which are bolted to a heavy 
pair of runners. The plow is drawn by from six to sixteen horses, 
depending on the depth of snow and the width of road being cleared. 
Plows also are'made from two split logs or heavy sawed timbers 
about 16 feet long which are joined together at the apex of the 
triangle by means of a chain which passes through holes in the 
forward end of the logs at which point the draft power is attached- 
The angle between the sides may be regulated by means of cross 
bars, which are fitted into notches cut into the inner face of the 
logs or timbers. Such snowplows are made reversible in order 
to facilitate a change in the direction of travel. The chain hold- 
ing together the forward ends of the logs at the apex of the triangle 
is removed, the rear ends of the logs are then brought together 
and fastened with the chain, and the point of draft attachment 
is then reversed. This scheme is especially useful since it often 
is difficult to turn around such a snow plow, owing to its unwieldy 
character. Special care is necessary when roads cross lakes or 
