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Wag′on-drag.

A shoe secured by a chain to the bed or coupling of the vehicle, and forming a temporary runner which receives the weight of the wheel, and by friction on the ground arrests the speed of the vehicle in going down hill.

In the United States, a lock is preferred. See wagon-lock.

Drag.

In its simple form, it is a cast-iron shoe to receive the wheel, being secured by a chain to some part of the vehicle, so as to drag thereby. It is suspended to a hook on the carriage when not in use.

Kneebone's drag (English) is curved to the contour of the wheel, and is anchored to the carriage by a chain of such a length as to allow the wheel to run up on to it when detached from its suspensory hook on the carriage for that purpose. It has a roller in front, which diminishes its friction on the ground and throws the wear on the rear part of the shoe.

Kneebone's drag.

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