Historically wooden horse drawn wagon gears had smaller front wheels to enable the front wheels to ,in a sharp turn ,left or right,avoid rubbing against the wagon box/bed. Early in the last century on some light wooden wagons gears ,mostly in european countrys the front and rear wheels are the same dimension. In the new world when wagon gear builders adopted steel wheels for thier running gears front and rear were the same size.Why were the rear wheels of say a Conestoga wagon gear larger than the fronts? Good question,I don"t know the answer to that although I think there must be a logical answer. Suppose that if a wagon with a load got stuck on a road of mud in that era that the front was sort of pulled upwards and forward from the tractive effort of the heavy horse or horses pulling it while the large rear wheel was a good place for men on both sides to apply weight and muscle to get the wagon moving. a small wheel on the rear would be hard for a person to grasp ahold of to help extricate the wagon from the muc.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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