. American telephone practice . lling up a crimped lead ribbon in the form of a spiral,of a size to fit tightly in the holes. The plates are then treatedelectro-chemically in order to form the proper oxide from this positive and negative plates so formed present a large sur-face to the electrolyte for it to act upon, the negative plates onaccount of the porous, spongy, lead blocks, and the positive plateson account of the crimped lead ribbon. The plates are held apartby long hard-rubber washers hung over each end of each negativeelement. These are placed in a vertical position to pr
. American telephone practice . lling up a crimped lead ribbon in the form of a spiral,of a size to fit tightly in the holes. The plates are then treatedelectro-chemically in order to form the proper oxide from this positive and negative plates so formed present a large sur-face to the electrolyte for it to act upon, the negative plates onaccount of the porous, spongy, lead blocks, and the positive plateson account of the crimped lead ribbon. The plates are held apartby long hard-rubber washers hung over each end of each negativeelement. These are placed in a vertical position to prevent forminga shelf upon which loose particles from the plates might lodge andform a short-circuit. These cells have amply demonstrated theiradaptability to telephone use by long service in this and other fields. STORAGE BATTERIES. 575 The electrolyte for these cells is a mixture of sulphuric acidand water in the proportion of about five parts of water to one ofacid. The proper specific gravity of this mixture, as specified by. FIG. 414.—BATTERY PLANT. the manufacturers, is from 1180 to 1190, as indicated on an ordinaryhydrometer. In Fig. 412, the general appearance of one of these cells havingsix negative and five positive plates is seen. Fig. 413 shows a larger•cell having ten negative and nine positive plates mounted in a 576 AMERICAS TELEPHONE PRACTICE. lead-lined wooden tank. Lead-lined wooden tanks are preferableto glass jars in large batteries, on account of the liability of glassto breakage. In small capacity batteries, glass cells are used in mostcases, one of their advantages being that they allow of free inspec-tion of the plates more than would lead-lined tanks of small size. In Fig. 414 is shown a portion of two batteries of chloride accu-mulators as installed in one of the large common battery exchangesof the Kellogg Switch-Board and Supply Company. These batterieshave eleven cells each, thus giving approximately twenty-four voltseach. They are used for suppl
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