"Fordson Snowmobile 1926 This was known as an Armstead Snow-motor. Hauling capacity was said to be five tons. Each drum receives power from a separate clutch which, depending on the position of the steering gear, engages and disengages. It can also traverse bare ground. This machine hauled mail from Truckee to North Lake Tahoe." (Quote from website above)
I believe the video tractor was built by another mfg in 1920. It could be Ericson.
There is probably a pinion gear in the center of the rear housing. That would drive left and right hand gears opposite one another. The gears probably turned clutchable shafts than ran to the sprockets. You can see the lever that controled the clutches. It is connected to the steering wheel thru a drag link and pitman arm.
Nowadays it would be hydraulically driven. Apparently, the oil companies in Alaska have used these screw drives as they are very easy on the tundra in all seasons.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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