A lamp depending for its action on loose contact between two carbon
electrodes. At the contact a species of incandescence with incipient
arcs is produced. One of the electrodes is usually flat or nearly so,
and the other one of pencil shape rests upon it.

A lamp in which the light is produced by a voltaic arc. Carbon
electrodes are almost universally employed. Special mechanism, operating
partly by spring or gravity and partly by electricity, is employed to
regulate the distance apart of the carbons, to let them touch when no
current passes, and to separate them when current is first turned on.
The most [...]

These are sometimes laminated to prevent the formation of eddy currents.
The lamination should be radial, and the strips composing it should be
insulated from each other by superficial oxidation, oiling or
enamelling, and should be united only at their ends.

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 [...]

Made up of thin plates, as a laminated armature core or converter core.

(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.

Symbol for length and also for the unit of inductance or coefficient of
induction, because the dimensions of inductance are length.