Williss classification is founded, in the first place, on comparative motion, as expressed by velocity ratio and directional relation, and in the second place, on the mode of connection of the driver and follower.
He divides the elementary combinations in mechanism into three classes, of which the characters are as follows: Class A: Directional relation constant; velocity ratio constant.
The comparative motion of the first driver and last follower is obtained by combining the proportions expressing by their terms the velocity ratios and by their signs the directional relations of the several elementary combinations of which the train consists.
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