vacuum pencil - ορισμός. Τι είναι το vacuum pencil
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Τι (ποιος) είναι vacuum pencil - ορισμός

DEVICE FOR SHARPENING A PENCIL'S WRITING POINT BY SHAVING AWAY ITS WORN SURFACE
Pencil sharpeners; Pencil sharpening; Pencil sharpenings; Pencil parer; Pencil topper; Parer, Pencil parer, Pencil topper
  • Video of a mechanical pencil sharpener, showing gearing and helical sharpening blades
  • Jupiter 1 with rotary disk cutters
  • Lead sharpener/lead pointer and 2 mm pencil lead in a [[leadholder]]
  • Specialized sharpener for carpenter's flat pencils
  • [[Magnesium alloy]] prism sharpener
  • A manual prism sharpener generates long fan-shaped shavings
  • An unusual hand-cranked prism sharpener, with a shavings cover
  • razor blade]]

propelling pencil         
PENCIL WITH A REPLACEABLE AND MECHANICALLY EXTENDABLE SOLID PIGMENT CORE
Propelling pencil; Mechanical pencils; Clicky pencil; Clutch pencil; Leadholder; Lead holder; Technical pencil; Automatic pencils; Automatic pencil; Mechanical Pencil
¦ noun a pencil with a thin replaceable lead that may be extended as the point is worn away.
Carpenter pencil         
  • Old English]] letters are easier to draw with a notched carpenter pencil than with an ordinary pen<ref name="as"/>
PENCIL WITH ELLIPTICAL OR RECTANGULAR CROSS-SECTION, WHICH CAN BE USED TO DRAW ON ROUGH SURFACES
Carpenter's pencil; Carpentry pencil
A carpenter pencil (carpentry pencil, carpenter's pencil) is a pencil that has a body with a rectangular or elliptical cross-section to prevent it from rolling away. Carpenter pencils are easier to grip than standard pencils, because they have a larger surface area.
Pencil (optics)         
  • A pencil-beam radar
BEAM OF ELECTROMAGNETIC RADIATION OR CHARGED PARTICLES
Pencil (physics); Pencil of rays; Pencil beam; Pencil-beam radar; Narrow beam
In optics, a pencil or pencil of rays is a geometric construct used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a narrow beam (conical or cylindrical).

Βικιπαίδεια

Pencil sharpener

A pencil sharpener (or pencil pointer, or in Ireland a parer or topper) is a tool for sharpening a pencil's writing point by shaving away its worn surface. Pencil sharpeners may be operated manually or by an electric motor. It is common for many sharpeners to have a casing around them, which can be removed for emptying the pencil shavings debris into a bin.