Kohlrausch's Law.
A law of the rate of travel of the elements and radicals in solutions
under the effects of electrolysis. It states that each element under the
effects of electrolysis has a rate of travel for a given liquid, which
is independent of the element with which it was combined. The rates of
travel are stated for different elements in centimeters per hour for a
potential difference of one or more volts per centimeter of path.
[Friedrich Wilhelm Georg Kohlrausch (1840-1910)]
Kookogey's Solution.
An acid exciting and depolarizing solution for a zinc-carbon couple,
such as a Bunsen battery. Its formula is: Potassium bichromate, 227
parts; water, boiling, 1,134 parts; while boiling add very carefully and
slowly 1,558 parts concentrated sulphuric acid. All parts are by weight.
Use cold.
Krizik's Cores.
Cores of iron for use with magnetizing coils, q. v. They are so shaped,
the metal increasing in quantity per unit of length, as the centre is
approached, that the pull of the excited coil upon them will as far as
possible be equal in all positions. A uniform cylinder is attracted with
varying force according to its position; the Krizik bars or cores are
attracted approximately uniformly through a considerable range.
L.
Symbol for length and also for the unit of inductance or coefficient of
induction, because the dimensions of inductance are length.
Lag, Angle of.
(a) The angle of displacement of the magnetic axis of an armature of a
dynamo, due to its magnetic lag. The axis of magnetism is displaced in
the direction of rotation. (See Magnetic Lag.)
(b) The angle expressing the lag of alternating current and
electro-motive force phases.
Laminated. adj.
Made up of thin plates, as a laminated armature core or converter core.
Lamination.
The building up of an armature core or other thing out of plates. The
cores of dynamo armatures or of alternating current converters are often
laminated. Thus a drum armature core may consist of a quantity of thin
iron discs, strung upon a rod and rigidly secured, either with or
without paper insulation between the discs. If no paper is used the film
of oxide on the iron is relied on for insulation. The object of
lamination is to break up the electrical continuity of the core, so as
to avoid Foucault currents. (See Currents, Foucault.) The laminations
should be at right angles to the direction of the Foucault currents
which would be produced, or in most cases should be at right angles to
the active parts of the wire windings.