Arrangements are now available for utilizing the public sources of electric lighting and power. There are two forms of the force which can be diverted from the street mains to the office instruments—the arc and the incandescent—and both forms are now in operation in a great many cities and towns. By means of a "current adapter," the current from a sixteen-candle lamp can be fitted to a suitable resistance coil's box and a proper milliam-péremeter, whereby the strength can be regulated according to the purposes of the operator; or, by means of a current adapter, the current can be utilized to energize the coils of a faradic battery, whereby the faradic current with all its modifications can be produced. Similarly, the street supply may be brought into service to perform the part of a caustic battery, or it may be used to energize the storage cell, and this in turn be made to do duty as a galvanic or faradic current, or for heating and lighting.