COUPLING

is an appliance used in machinery for the purpose of connecting different parts. As applied to the cars on a railway, it signifies the method by which the two cars are joined together. The C. may be one which is worked by hand, or an automatic one, the latter acting as a means of joining when the two cars come together. The ordinary C., which is not automatic, consists of links and a screw. On one car is a hook and one link is placed on the hook and made secure by means of the screw. There are various other forms of OC, used. for different parts of machinery.