Copper Stripping Bath.
There is generally no object in stripping copper from objects. It can be
done with any of the regular copper baths using the objects to be
stripped as anode. The danger of dissolving the base itself and thereby
injuring the article and spoiling the bath is obvious.
Cord Adjuster.
A device for shortening or lengthening the flexible cord, or flexible
wire supplying the current, and by which an incandescent lamp is
suspended. It often is merely a little block of wood perforated with two
holes through which the wires pass, and in which they are retained in
any desired position by friction and their own stiffness.
Fig. 113. FLEXIBLE CORD ADJUSTER.
Cord, Flexible.
A pair of flexible wire conductors, insulated lightly, twisted together
and forming apparently a cord. They are used for minor services, such as
single lamps and the like, and are designated according to the service
they perform, such as battery cords, dental cords (for supplying dental
apparatus) and other titles.
Core.
(a) The conductor or conductors of an electric cable. (See Cable Core.)
(b) The iron mass, generally central in an electro-magnet or armature,
around which the wire is coiled. It acts by its high permeance to
concentrate or multiply the lines of force, thus maintaining a more
intense field. (See Armature--Magnet, Electro--Magnet, Field--Core,
Laminated). In converters or transformers (See Converter) it often
surrounds the wire coils.
Core-discs.
Discs of thin wire, for building up armature cores. (See Laminated
Core.) The usual form of core is a cylinder. A number of thin discs of
iron are strung upon the central shaft and pressed firmly together by
end nuts or keys. This arrangement, it will be seen, gives a cylinder as
basis for winding the wire on.
Core-discs, Pierced.
Core-discs for an armature of dynamo or motor, which are pierced around
the periphery. Tubes of insulating material pass through the peripheral
holes, and through these the conductors or windings are carried. The
conductors are thus embedded in a mass of iron and are protected from
eddy currents, and they act to reduce the reluctance of the air gaps.
From a mechanical point of view they are very good. For voltages over
100 they are not advised.
Synonym--Perforated Core-discs.