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to a height sufficient for a person, standing, to rest against. GALVANIC BATTERY.--This article is used for the purpose of giving to imperfectly coated plates a thicker covering of silver. The form of battery now most universally employed for electrotype, and other galvanic purposes, is Smee's--Fig. 20. It consists [hipho_20.gif] of a piece of platinized silver, A, on the top of which is fixed a beam of wood, B, to prevent contact with the silver. A binding screw C is soldered on to the silver plate to connect it with any desired object, by means of the copper wire, e. A plate of amalgamated zinc, D, varying with the fancy of the operator from one half to the entire width of the silver is placed on each side of the wood. This is set into a glass vessel, P,--the extreme ends of the wood resting upon its edge--on which the acid with which it is charged has no effect. The jar is charged with sulphurid acid, (common oil of vitriol) diluted in eight parts its bulk of water. The zinc plates of the battery have been amalgamated with quicksilver, and when the battery is set into the jar of acid there should be no action percieved upon them when the poles F, G, are not in contact. Should any action be percieved, it indicates imperfect amalgamation; this can be easily remedied by pouring a little mercury upon them immediately after removing them from the acid, taking care to get none upon the centre plate A. Directions for use.--A sheet of silver must be attached to the wire connected with the centre plate A of the battery, and placed in the silver solution--prepared as directed below. The plate to be silvered is first cleaned with diluted sulphuric acid,