. Practical wireless telegraphy; a complete text book for students of radio communication . dio-transmitter. A clearer interpretation of the practical application of the term amperehour as appliedto the rating of storage cells may be obtained from the following explanation. For ex-ample, the chloride type of cell is rated on an 8 hour basis and the exide cell on a 4 hourbasis. Thus if the chloride cell is rated as having capacity of 60 amperehours, the normaldischarge rate is determined by simply dividing the rating 60 by 8 or 7j^ amperes, which isthe normal current in amperes to be taken from
. Practical wireless telegraphy; a complete text book for students of radio communication . dio-transmitter. A clearer interpretation of the practical application of the term amperehour as appliedto the rating of storage cells may be obtained from the following explanation. For ex-ample, the chloride type of cell is rated on an 8 hour basis and the exide cell on a 4 hourbasis. Thus if the chloride cell is rated as having capacity of 60 amperehours, the normaldischarge rate is determined by simply dividing the rating 60 by 8 or 7j^ amperes, which isthe normal current in amperes to be taken from the cell during discharge, and in the samemanner the normal discharge rate of a 60 amperehour exide cell is found to be IS normal discharge rate of the chloride lead cells (in use in the Marconi Service) is alsothe normal charging rate, but different charging rates are given for the exide lead cellaccording to the rated capacity of the battery. Generally at the beginning, the batteries arecharged at a heavy rate, but as the charge progresses the charging current is Fig. 81—-Simple Cliarging Circuit. 67. Fundamental Facts Concerning the Storage Cell. The student shouldbear in mind certain facts concerning the storage cell: It has low internal resistance and therefore delivers a very strong flow of current is more lasting than in the ordinary types of primarycells. The charging process requires considerable time—a matter of hours toconvert the surface of the plates to so-called active the charging period, a stated number of amperes must passthrough the cell—the actual value being designated by the normal rate of discharge is given by the manufacturers which must notbe exceeded except in special types. The fully charged voltage of the lead cell averages volts on opencircuit, values as high as or volts being obtained vnth the chargingcurrent flowing. The lead cell is said to be discharged when the voltage
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