COUPLING

In Machinery, this term is applied to any contrivance for connecting or disconnecting the different parts of a machine, and particularly for eft'ecting the longitudinal connexion of shafts. Hook's Joint (DiCT. OF Science) is one of the most ingenious of the contrivances of this kind. (See Buchanan's Practical E ays on Mill Work, ^c, with Additions, by Tredgold and Rennie.) [s. 1377]