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 for Carbon point
From The Collaborative International Dictionary of English v.0.48 :

  Carbon \Car"bon\ (k[aum]r"b[o^]n), n. [F. carbone, fr. L. carbo
     coal; cf. Skr. [,c]r[=a] to cook.] (Chem.)
     1. An elementary substance, not metallic in its nature, which
        is present in all organic compounds. Atomic weight 11.97.
        Symbol C. it is combustible, and forms the base of
        lampblack and charcoal, and enters largely into mineral
        coals. In its pure crystallized state it constitutes the
        diamond, the hardest of known substances, occuring in
        monometric crystals like the octahedron, etc. Another
        modification is graphite, or blacklead, and in this it is
        soft, and occurs in hexagonal prisms or tables. When
        united with oxygen it forms carbon dioxide, commonly
        called carbonic acid, or carbonic oxide, according to the
        proportions of the oxygen; when united with hydrogen, it
        forms various compounds called hydrocarbons. Compare
        Diamond, and Graphite.
        [1913 Webster]
     2. (Elec.) A carbon rod or pencil used in an arc lamp; also,
        a plate or piece of carbon used as one of the elements of
        a voltaic battery.
        [Webster 1913 Suppl.]
     3. a sheet of carbon paper.
     4. a carbon copy.
     Carbon compounds, Compounds of carbon (Chem.), those
        compounds consisting largely of carbon, commonly produced
        by animals and plants, and hence called organic compounds,
        though their synthesis may be effected in many cases in
        the laboratory.
        [1913 Webster]
              The formation of the compounds of carbon is not
              dependent upon the life process.      --I. Remsen
     carbon copy, originally, a copy of a document made by use
        of a carbon paper, but now used generally to refer to
        any copy of a document made by a mechanical process, such
        as xerographic copying.
     Carbon dioxide, Carbon monoxide. (Chem.) See under
     Carbon light (Elec.), an extremely brilliant electric light
        produced by passing a galvanic current through two carbon
        points kept constantly with their apexes neary in contact.
     Carbon point (Elec.), a small cylinder or bit of gas carbon
        moved forward by clockwork so that, as it is burned away
        by the electric current, it shall constantly maintain its
        proper relation to the opposing point.
     Carbon paper, a thin type of paper coated with a
        dark-colored waxy substance which can be transferred to
        another sheet of paper underneath it by pressing on the
        carbon paper. It is used by placing a sheet between two
        sheets of ordinary writing paper, and then writing or
        typing on the top sheet, by which process a copy of the
        writing or typing is transferred to the second sheet
        below, making a copy without the need for writing or
        typing a second time. Multiple sheets may be used, with a
        carbon paper placed above each plain paper to which an
        impression is to be transferred. In 1997 such paper was
        still used, particularly to make multiple copies of
        filled-in purchase invoice forms, but in most applications
        this technique has been superseded by the more faithful
        xerographic reproduction and computerized printing
     Carbon tissue, paper coated with gelatine and pigment, used
        in the autotype process of photography. --Abney.
     Gas carbon, a compact variety of carbon obtained as an
        incrustation on the interior of gas retorts, and used for
        the manufacture of the carbon rods of pencils for the
        voltaic, arc, and for the plates of voltaic batteries,
        [1913 Webster]

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