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A pencil-beam radar A pencil-beam radar. 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).
Before the development of dedicated pencil sharpeners, a pencil was sharpened by whittling with a knife.. The development of pencil sharpeners began in France when a French book from 1822 reported in detail about an invention of Mr. C. A. Boucher (Paris) for the construction of a pencil sharpener.
A pencil (/ ˈ p ɛ n s ə l / ⓘ) is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand.
Carpenter's pencil on the job. A carpenter pencil (carpentry pencil, carpenter's pencil) is a pencil that has a body with a rectangular or elliptical cross-section to allow it to be used as a quick reference to 1/4 and 1/2 inch measurements (15mm and 7.5mm in metric versions).
A pencil case or pencil box is a container used to store pencils.A pencil case can also contain a variety of other stationery such as sharpeners, pens, glue sticks, erasers, scissors, and rulers.
Korean actress Shin Min-a in a pencil skirt, showing the slim fit. The pencil skirt may be worn either as a separate piece of clothing or as part of a suit.A pencil skirt usually has a vent at the back, or less commonly at the sides, since its slim, narrow shape can otherwise restrict the movement of the wearer.
Parallel rule in plastic with aluminum arms lying on a cutting mat. Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]