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Black lead   /blæk lɛd/   Listen
noun
Black lead  n.  Plumbago; graphite. It leaves a blackish mark somewhat like lead. See Graphite.


Lead  n.  
1.
(Chem.) One of the elements, a heavy, pliable, inelastic metal, having a bright, bluish color, but easily tarnished. It is both malleable and ductile, though with little tenacity, and is used for tubes, sheets, bullets, etc. Its specific gravity is 11.37. It is easily fusible (melting point 327.5° C), forms alloys with other metals, and is an ingredient of solder and type metal. Atomic number 82. Atomic weight, 207.2. Symbol Pb (L. Plumbum). It is chiefly obtained from the mineral galena, lead sulphide.
2.
An article made of lead or an alloy of lead; as:
(a)
A plummet or mass of lead, used in sounding at sea.
(b)
(Print.) A thin strip of type metal, used to separate lines of type in printing.
(c)
Sheets or plates of lead used as a covering for roofs; hence, pl., a roof covered with lead sheets or terne plates. "I would have the tower two stories, and goodly leads upon the top."
3.
A small cylinder of black lead or graphite, used in pencils.
Black lead, graphite or plumbago; so called from its leadlike appearance and streak. (Colloq.)
Coasting lead, a sounding lead intermediate in weight between a hand lead and deep-sea lead.
Deep-sea lead, the heaviest of sounding leads, used in water exceeding a hundred fathoms in depth.
Hand lead, a small lead use for sounding in shallow water.
Krems lead, Kremnitz lead, a pure variety of white lead, formed into tablets, and called also Krems white, or Kremnitz white, and Vienna white.
Lead arming, tallow put in the hollow of a sounding lead. See To arm the lead (below).
Lead colic. See under Colic.
Lead color, a deep bluish gray color, like tarnished lead.
Lead glance. (Min.) Same as Galena.
Lead line
(a)
(Med.) A dark line along the gums produced by a deposit of metallic lead, due to lead poisoning.
(b)
(Naut.) A sounding line.
Lead mill, a leaden polishing wheel, used by lapidaries.
Lead ocher (Min.), a massive sulphur-yellow oxide of lead. Same as Massicot.
Lead pencil, a pencil of which the marking material is graphite (black lead).
Lead plant (Bot.), a low leguminous plant, genus Amorpha (Amorpha canescens), found in the Northwestern United States, where its presence is supposed to indicate lead ore.
Lead tree.
(a)
(Bot.) A West Indian name for the tropical, leguminous tree, Leucaena glauca; probably so called from the glaucous color of the foliage.
(b)
(Chem.) Lead crystallized in arborescent forms from a solution of some lead salt, as by suspending a strip of zinc in lead acetate.
Mock lead, a miner's term for blende.
Red lead, a scarlet, crystalline, granular powder, consisting of minium when pure, but commonly containing several of the oxides of lead. It is used as a paint or cement and also as an ingredient of flint glass.
Red lead ore (Min.), crocoite.
Sugar of lead, acetate of lead.
To arm the lead, to fill the hollow in the bottom of a sounding lead with tallow in order to discover the nature of the bottom by the substances adhering.
To cast the lead, or To heave the lead, to cast the sounding lead for ascertaining the depth of water.
White lead, hydrated carbonate of lead, obtained as a white, amorphous powder, and much used as an ingredient of white paint.





Collaborative International Dictionary of English 0.48


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"Black lead" Quotes from Famous Books



... file to depths required, which must be so as to allow a playing card to slip comfortably under the E string when taut, a little more space for the other three being necessary, especially the G. Rub a black lead pencil through the cuts, and work them very smooth with a thin, round piece of steel, which makes all the strings much easier to slide afterwards and ...
— Violin Making - 'The Strad' Library, No. IX. • Walter H. Mayson
... in Surbiton yesterday," said the frivolous voice, "and an errand-boy had done his worst with it with a very black lead pencil." ...
— Punch, or the London Charivari, Vol. 159, July 28th, 1920 • Various
... to the London Chemical News (1861) a paper on the employment of carbon as a means of permanent record. The imperishable nature of carbon, in its various forms of lamp-black, ivory-black, wood-charcoal, and graphite or black lead, holds out much greater promise of being usefully employed in the manufacture of a permanent writing material; since, for this substance, in its elementary condition and at ordinary temperatures, there exists ...
— Forty Centuries of Ink • David N. Carvalho
... genuine signature holding the paper on which the forgery is to be produced; tracing the outline of the signature by means of a pencil, and then with ink to write over the pencil copy. But as the method necessitates the use of an india rubber to remove the surplus black lead where not covered by the ink, evidences of the use of the rubber will be found to occur, and traces of the black lead can be found by the microscope. While the appearances and conditions are common to traced signatures, there are in addition to their presence generally found ...
— Disputed Handwriting • Jerome B. Lavay
... Mickle, the translator of The Lusiad[539], and I went to visit him at this place a few days afterwards. He was not at home; but having a curiosity to see his apartment, we went in and found curious scraps of descriptions of animals, scrawled upon the wall with a black lead pencil[540]. ...
— Life Of Johnson, Vol. 2 • Boswell, Edited by Birkbeck Hill


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