Bath, Multipolar Electric.

An electro-medical bath with a number of electrodes instead of two.

Bath, Stripping.

In electro-plating a solution used for dissolving and thus removing the plating from any object. The stripping bath is of the same general type as the plating bath for the same metal as the one to be dissolved. The object to be "stripped" is made the anode of a plating circuit, and as the current acts the old plating is attacked and dissolves, leaving the body of the article bare. It is simply the operation of plating reversed. The same term is applied to baths acting by simple solution.

Stripping baths are described under the different metals as Silver Bath, Stripping--Gold Bath, Stripping.

Bath, Unipolar Electric.

An electro-medical bath, in which only one electrode connects with the water of the bath. The second electrode is supported above the bath. The patient touches this while in the water whenever electric action is desired.

FIG. 36. THREE WIRE MOULDING OR BATTEN.

FIG. 37. TWO WIRE MOULDING OR BATTEN.

58 STANDARD ELECTRICAL DICTIONARY.

Batten.

A strip of wood grooved longitudinally for holding wires in wiring apartments for electric light or power. In use they are fastened to the wall, grooves inward, or else grooves outward, with the wires lying in the grooves and covered with the covering strip. For two wire work each batten contains two grooves; for the three wire system it contains three grooves.

Synonym--Moulding.

Battery.

A combination of parts or elements for the production of electrical action. The term is princ.i.p.ally applied to voltaic batteries, but there are also magnetic batteries, batteries of Leyden jars, and other combinations, described in their places, which come under this category.

[Transcriber's note: A group of similar items such as questions, machines, parts, guns, or electric cells.]

Battery, Acetic Acid.

A battery whose active solution or excitant is acetic acid or vinegar.

This acid has been used by Pulvermacher in his medical battery, as being a substance found in every household in the form of vinegar. It is now but little used.

Battery, Alum.

A battery using as excitant a solution of alum. This battery has had some application for electric clocks, but only to a limited extent.

Fig. 38. BALLOON OR FLASK BATTERY.

Battery, Aluminum.

A battery in which aluminum is the negative plate and aluminum sulphate the excitant. It is mounted like the gravity battery. Its electro-motive force is 0.2 volt.

59 STANDARD ELECTRICAL DICTIONARY.

Battery, Bagration.

A battery with zinc and carbon electrodes immersed in earth sprinkled with sal ammoniac (ammonium chloride). The copper is preferably first immersed in sal ammoniac solution and dried, until a green layer is formed on its surface.

The battery is highly praised for its constancy by De la Rive, but may be regarded as obsolete.

Battery, Balloon.

A form of gravity battery into whose centre a globular flask, B, is inverted, which is filled before inversion with copper sulphate, of which 2 lbs. are used, and water, so as to remain full. This acts as a reservoir of copper sulphate, which it constantly supplies. The gla.s.s jar is closed with a perforated wooden cover.

Battery, Banked.

(a) A battery arranged to feed a number of separate circuits.

(b) A battery connected in parallel or in multiple arc.

Battery, Bichromate.

A battery with amalgamated zinc and carbon plates, with an exciting fluid composed of sulphuric acid, water, and pota.s.sium bichromate. For formula of such solutions see Electropoion Fluid--Kookogey's Solution--Poggendorff's Solution--Trouv?'s Solution--Delaurier's Solution, and others. (See Index.)

Battery, Bunsen.

A two fluid porous cell battery. The negative plate is carbon, the positive plate, amalgamated zinc. The depolarizer is nitric acid or electropoion fluid, q.v., in which the carbon is immersed. The last named depolarizer or some equivalent chromic acid depolarizing mixture is now universally used. The excitant is a dilute solution of sulphuric acid. Originally the carbon was made cylindrical in shape and surrounded the porous cups, in which the zinc was placed. This disposition is now generally reversed. The electro-motive force is 1.9 volts. The depolarizing solution is placed in the compartment with the carbon. The excitant surrounds the zinc.

Fig. 39. BUNSEN'S BATTERY.

60 STANDARD ELECTRICAL DICTIONARY.

Battery, Cadmium.

A battery in which cadmium is the negative plate, sulphate of cadmium solution the excitant and depolarizer, and zinc the positive plate.

Electro-motive force, .31 volt or about one third of a Daniell cell. It is mounted like a gravity battery.

Battery, Callan.

A modification of Grove's battery. Platinized lead is used for the negative plate, and as a depolarizer a mixture of 4 parts concentrated sulphuric acid, 2 parts of nitric acid, and 2 parts of a saturated solution of pota.s.sium nitrate. (See Battery, Grove's.)

Battery, Camacho's.

A battery with carbon negative and amalgamated zinc positive electrodes.

The carbon is contained in a porous cup, packed with loose carbon.

Electropoion or other fluid of that type serves as excitant and depolarizer, and is delivered as shown from cell to cell by syphons.

Fig. 40. CAMACHO'S BATTERY.