Electric Lamps And Electric Lighting a Course of Four Lectures On Electric Illu
Electric Lamps And Electric Lighting a Course of Four Lectures On Electric Illu
John Ambrose Fleming
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247 in a glass vessel in dilute sulphuric acid, the plates being arranged so that alternate plates are identical and are connected together by a lead band welded to them. This arrangement constitutes a secondary cell, and a series of cells connected together is called a secondary battery. The plates in each cell are prevented from touching each other by separators of ebonite or glass, and are held off the bottom of the cell by ebonite bars. One great defect of the original packed grid type of p...late was a tendency for the active material to fall out of the interstices of the lead plate. This has been greatly remedied by careful manufacture. In some types of packed plate the active material is kept on the plate by enclosing the plate in a jacket made of perforated celluloid. This allows access of the electrolyte, but tends to prevent the falling out of material. The plates can then be placed much closer together, and a compact cell obtained which is useful for traction purposes. In some cases the active material is pressed into grooves pressed or cast in the lead plate.
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