STORAGE BATTERIES FOR FIRE ALARM USE.
Heretofore the cost of changing an alarm system from the old-fashioned gravity cells to storage batteries has been prohibitory. It has now been reduced to the lowest possible limit by the United States Battery company, of 552 State street, Brooklyn, New York. The United States storage battery has an e. m. f. of two and one-half Volts, and the gravity cell has only about one volt. Fifty of the former will produce better results than one hundred of the latter, and, by using duplicate sets of storage batteries, the margin of safely and efficiency will be increased one hundred per cent., while the cost of maintenance will be reduced to a minimum. For instance, one hundred gravity cells will cost to maintain for five years at $1 50 per cell per year, 17.50. Duplicate sets of fifty each of United States storage batteries will cost for five years. including original cost, with switchboard, etc., about $300. Also, ten United States storage batteries will give twenty-five volts, while twenty other stornge batteries will give only twenty-four volts.
The accompanying illustrations show the factory and main office of this company aud the arrangement of batteries iu the fire alarm system at Paterson, N. J., where these batteries are giving entire satisfaction, as are many other similar systems supplied with them.
Details as to cost und information about special installations can be had upon application to the United States Battery company, 552 State street, Brooklyn, New York.