There are two general classes of storage batteries; the lead plate, sulphuric acid cell, such as the Exide, Willard, Philco, and the nickel, iron-alkali cells developed by Edison. The lead
Fig. 12--Positive and negative group of plates of a storage battery.
Fig. 13--Cut-away view of a storage battery showing details of construction of one cell and the connections to the other two cells.
plate type of storage battery is mostly used as a source of power therefore this type will be described first.
Storage batteries consist of two or more chemical cells in which the chemical action is reversible--that is, an electric
