from 8 to 10 miles an hour if wagons. Another great difficulty encountered, espe- principal lumber camps, are in a very crude condition, desired. It is used, however, in the forests, where cially in California, is sand. This is partly overcome most of them having no paved surface, while the grades… … similar to that of .the farm engine is required than in farming opera- which has already been described in tions with the tractor. The larger General View of the Freighting Engine. the Scientific American. The driv- types have an engineer and fireman, ing wheels, however, have narrower tires,…
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