Coupling

—1 The act of connecting a group of electric cells so as to form an electric battery. Cells may be coupled in three ways: 1, series; 2, parallel, and 3, series multiple. A series connection consists in connecting unlike poles; a parallel connection is made by connecting like poles, and a series multiple connection consists in connecting in parallel two batteries nected in series. whose cells are con- 2. The uniting of a number of dynamos in Jarge generating stations so that as the load fluctuates it can be shifted from one to another as the case requires; or when the load exceeds the capacity of the largest dynamo in the plant the output of one can be added to that of another. 3. An attachment whereby one piece of mechanism constrains another part to follow the movements of the first; it may be an absolutely rigid connection as a flanged coupling to unite sections of shafting together; flexible within limits, as a universal joint or a diaphragm coupling.