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Pencil vs Optigraph - What's the difference?

pencil | optigraph |

As nouns the difference between pencil and optigraph

is that pencil is (obsolete) a paintbrush while optigraph is a telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror it is used for delineating landscapes by means of an attached pencil.

As a verb pencil

is to write something using a pencil.

pencil

English

(wikipedia pencil)

Noun

(en noun)
  • (obsolete) A paintbrush.
  • * 1590 , (Edmund Spenser), The Faerie Queene , III.0:
    • But living art may not least part expresse, / Nor life-resembling pencill it can paynt.
  • *, II.17:
  • *:why is it not lawfull for every man to pourtray himself with his pen, as it was for him to doe it with a pensell ?
  • Writing utensil that uses graphite (commonly referred to as lead). Regular pencils usually have a graphite shaft surrounded by wood. Also available in a mechanical version where the graphite length can be adjusted and sharpening is not needed.
  • (geometry) A family of geometric objects with a common property, such as the set of lines that pass through a given point in a projective plane.
  • (optics) An aggregate or collection of rays of light, especially when diverging from, or converging to, a point.
  • * 1863 , The Civil Engineer and Architect's Journal
    • When, by the pencil becoming oblique to the surface, the vergency produced on the pencil becomes changed, the primary and secondary focal points, V and H, separate
  • (medicine, archaic) A small medicated bougie.

    • Derived terms

    * carpenter's pencil * china pencil * color pencil, colored pencil, coloring pencil * colour pencil, coloured pencil, colouring pencil * golf pencil * grease pencil * lead pencil * mechanical pencil * * pencil crayon * pencil lead * pencil pusher * pencil sharpener * pencil skirt * pencil stub * propelling pencil * wax pencil

    Verb

  • to write something using a pencil
    • I penciled''' (''BrEn:'' '''pencilled ) it in my notebook.

    Derived terms

    * pencil in

    External links

    * (wikipedia "pencil") 1000 English basic words

    optigraph

    English

    Noun

    (en noun)
  • A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes by means of an attached pencil.
    • (Webster 1913)