Storage Battery

—A source of electricity made up of a group of storage cells; a secondary, as distinguished from a primary battery. Each cell of a storage battery contains a positive electrode or plate provided with lead peroxide (PbOeg) as its active material, and a negative plate of sponge lead (Pb) immersed together in an electrolyte of dilute sulphuric acid hese elements are held in a containing cell or jar composed of gla , hard rubber, lead lined wood or any other acid proof water tight material, insulated from the other cells and resting on insulated supports. The storage cell is charged by a current of electricity which performs chemical action upon the elements. When discharging, the chemical action is reversed and an electric current is derived from the cell ranging from 2.1 volts at the start, to 1.75 volts when the cell requires recharging. In all lead storage batteries, one of the objects desired is to obtain a large lead surface for small ma , as the capacity and discharge rates are strictly proportional to the amount of surface involved. This nece ary maximum of surface has hitherto been obtained in one of two ways. The earlier method was to slowly eat out the lead plates by electrolysis until they had attained the requisite spongy condition, an affair of some time: and expense. he later way (and the one which is generally practiced) is to cast a frame of lead, with raised right angled ribs on each side, thus forming little depre ed squares, or to punch a lead plate full of holes, which squares or holes are then filled with a pasty mixture of red oxide of lead in positive plates, and with litharge in neg as tives. he manufacturer of one of the most efficient types of battery gives the following data: Discharge jn | Ampere Hour | _ ap Outside Dimensions Amperes Per |Capacity When | Z 2 œ of Hour During | Discharged in 5 Ri Jar in Inches 8 Hrs, |5 Hrs. |8 Hrs. |5 Hrs. |© Height |Length |Width 6 8ł 50 434 6% | 10} 5} 7 103 GO} 75230) AA Lt 7% 8% | 124 JOOLA 82 | 12% 7 10 14 80 70 10 12 6 7 123 | 17% | 100 | 874) 124 | 12 6 7 15 21 120 | 105 15 124 6 7 17% | 24% | 140 |1223] 173 | 123 63 7 20 28 160 | 140 20 124 9% | 52 22% | 314 | 180 | 1573], 22% | 124 9 63 25 35 200 |175 25 124 9 64 27% | 384 | 220 |1924] 27% | 123 9 64 30 2 240 |210 30 124 9 63 374 | 524 | 300 |2624] 374 | 124 9% 45 63 360 |315 45 124 9 52% | 734 | 420 |3673] 52% | 123 | 114