New Law Prism Battery

The New "Law Prism" Battery.

We illustrate on this page the new prism battery, known as above, of the Law Telephone Co., the sole manufacturers,

112 Liberty street. The sealed top, or lock top, keeps the solution from evaporating, so that the battery remains "set up" at least half as long again. This is a specal point of merit for tropical or sub-tropical service in

which the solution is likely to dry up very quickly. No paraffine is used in sealing. Owing to the corrugation of the carbons, as seen in cut, double the surface is exposed to the action of the solution. There is no need to

screw the top to get it on, as just a slight turn will secure the glass top against a pure rubber ring, entirely excluding air. These are all points tending to increase indefinitely the longevity of the battery, and the lock top is practically indestructible. It may be noted, too, that the constituent elements, zinc, carbon and gal ammoniac, are carefully analyzed before being put into the battery. A report from the well-known chemists, Stillwell & Cladding, says that the zinc rods contain no copper — iron 0.106, and zinc 99.884. The size of the battery, over all, is 4 1/4 x 4 1/4 X 7 1/2.