. American telephone practice . a heavy copper wire,which forms the negative pole. The negative electrode is a blockof carbon hanging through a slot in a wooden cover. The separateparts are shown in Fig. 69. The zinc rests in the bottom of aporous cup when in place. The electrolyte for this cell is made asfollows: Sodium bichromate 6 ounces Sulphuric acid 17 ounces Soft water 56 ounces PRIMARY BATTERIES. 91 Dissolve first the sodium bichromate in the water and then addslowly the sulphuric acid. (Never pour the water into the acid.)The mixture should be made in an earthen vessel, or if in a gla
. American telephone practice . a heavy copper wire,which forms the negative pole. The negative electrode is a blockof carbon hanging through a slot in a wooden cover. The separateparts are shown in Fig. 69. The zinc rests in the bottom of aporous cup when in place. The electrolyte for this cell is made asfollows: Sodium bichromate 6 ounces Sulphuric acid 17 ounces Soft water 56 ounces PRIMARY BATTERIES. 91 Dissolve first the sodium bichromate in the water and then addslowly the sulphuric acid. (Never pour the water into the acid.)The mixture should be made in an earthen vessel, or if in a glassjar, the jar should be placed in cold water in order to prevent over-heating. Another solution called electropoin fluid may be used as the elec-trolyte in this cell. It is made of bichromate of potash instead ofbichromate of sodium. The cell is set up according to the following directions: Place the quantity of solution made by the above formula in theglass jar. Put one teaspoonful of mercury in the bottom of the porous cup,. FIG. OF STANDARD FULLER CELL. add two teaspoonfuls of common salt, place the zinc in the bottomof the cup, and fill to within two inches of the top with soft water. Place the porous cup in the jar and put on the cover, passing thewire from the zinc through the hole provided for it. The cell isthen ready for use. The active element in the electrolyte in this cell is the sulphuricacid, which of course attacks the zinc. The bichromate of sodiumor of potash serves as a depolarizer, the oxygen in it combining withthe hydrogen, liberated at the positive pole, to form water. 92 AMERICAN TELEPHONE PRACTICE. The character of the electrolyte, containing as it does a mostvigorous acid, makes necessary great care that the proper methodsand materials be used in the construction of Fuller cells. The following specifications governing the furnishing of thesecells have been used with good results: One cell of Standard Fuller battery shall consist of the follow
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