I have not found the word "linkage" used earlier than Sylvester.

In carrying on a stock of a lethal, advantage can be taken of linkage.

Evidently, by exercising this linkage of stimulus and response.

When she was finished Rynason nodded for her to activate the linkage.

There is more than metaphor in such a comparison; there is the linkage of the immanent idea.

By kinematic synthesis is meant the designing of a linkage to produce a given series of motions for a particular purpose.

It appears from a comment in this lecture that Sylvester was responsible for the word "linkage."

According to Sylvester, a linkage consists of an even number of links, a "link-work" of an odd number.

Brilliant as was the conception of this linkage, it was followed up by a synthesis that is very little short of incredible.

This linkage, which was included in an extensive patent of 1784, and two alternative devices are illustrated here (fig. 9).