SLED AND SLED-HAULING 161 
will go down a very steep grade without a driver. The advan- 
tages of this methodj as compared to the use of yarding sleds, 
are that poorer roads may be used, less care has to ho exercised 
in felling, difficult "chances" can be easily logged without a heavy 
strain on the horses, and the output per crew can be increased 
from 50 to 100 per ('(^nt over that possible when yarding sleds 
are used under shnilar conditions. 
THE BOB 
In the Lake States and in the Adirondacks a "bob" is used 
in the place of a yarding sled. It has the front runners of a "two- 
sled," equipped with chains for binding on the logs. It is adapted 
for hauls under f mile when the distance is too great for snaking. 
From ten to sixteen logs may be hauled at one time on favor- 
able grades. 
THE "jumbo" 
The jumbo, a modification of the go-devil, is used on a snow 
haul in the Lake States, for distances not exceeding ^-mile, where 
the conditions do not warrant the use of heavy sleds. They 
are often used to haul timber out of swamps on roughly built, 
snow roads. When necessary the wettest places are corduroj^etl 
with hemlock or balsam brush. Jumbo sleds have the same loose 
jack-knife construction as go-devils. The runners, however, are 
8 feet long and have a gauge of 6| or 7 feet. The forward antl 
rear sleds are joined together by cross chains fastened to the bunks, 
which are spaced from 8 to 9 feet apart. The average load for 
a jmnbo ranges from 1000 to 1200 board feet, from 5 to 20 logs 
being carried at one time. The sleds are loaded by means of 
a crosshaul. Roads must be cut out, stumps removed and swamps 
corduroyed, but the cost of road construction is much less than 
for two-sleds. 
THE TWO-SLED 
The transportation of logs from the skidway to a landing on 
streams, to a railroad or to a mill often is effected by means of 
a heavy sled called the "two-sled," "twin-sled" or "wagon- 
sled." There is no standard type of two-sled even in a given 
region. Many sleds are made in the blacksmith shop of the log- 
ging camp in accordance with the ideas of the logging foreman. 
The gauge of sleds varies from 3^ feet on some operations in 
