. Practical wireless telegraphy; a complete text book for students of radio communication . if carbon and zinc are Secondary Cell.—A simple secondary cell popularly known as astorage battery consists of two or more plates of lead placed in a dilutesolution of sulphuric acid as in Fig. 4. One of the plates in this diagram isconnected to the positive terminal of two primary cells (connected in series)and the other plate to the negative terminal. When current flows fromthe primary battery for some time through the solution from plate to plate as inFig. 5 and afterwards the wires from
. Practical wireless telegraphy; a complete text book for students of radio communication . if carbon and zinc are Secondary Cell.—A simple secondary cell popularly known as astorage battery consists of two or more plates of lead placed in a dilutesolution of sulphuric acid as in Fig. 4. One of the plates in this diagram isconnected to the positive terminal of two primary cells (connected in series)and the other plate to the negative terminal. When current flows fromthe primary battery for some time through the solution from plate to plate as inFig. 5 and afterwards the wires from the primary battery are disconnected and * Cells of various types are described in books on elementary electricity to which the reader isreferred for a more detailed description. THE PRODUCTION OF ELECTROMOTIVE FORCE. the plates are joined by a conductor, current will flow from the lead plate whichwas connected to the positive terminal of the primary battery to the opposite leadplate, and within the cell, in the opposite direction. When the current flows from plate to ANODE LEAD m. H. Fig. 4- plate through the electrolyte, the plateconnected to the positive pole of the batteryreceives a brown coating of peroxide oflead but the opposite plate becomes spongyor porous. Since the passage of the cur-rent through the cell has left one plateunchanged while it has coated the surfaceof the other plate with lead peroxide, it isreasonable to expect that if the chargingbattery is disconnected and the two dis-similar lead plates connected by a wire, acurrent of electricity will flow through theexternal circuit. In fact, we now have theessentials of an ordinary chemical cell will continue to supply currentuntil the lead peroxide is partly used upand the plates will gradually return to thestate they were in before the chargingprocess took place. In order that theplates may be put in condition to deliverthey must be reconnected to the charging source and a new coating of -Simple D
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
