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A pencil sharpener (or pencil pointer, or in Ireland a parer or topper [1]) 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 ...
Beginning of animal evolution. [54] [55] 720–630 Ma Possible global glaciation [56] [57] which increased the atmospheric oxygen and decreased carbon dioxide, and was either caused by land plant evolution [58] or resulted in it. [59] Opinion is divided on whether it increased or decreased biodiversity or the rate of evolution. [60] [61] [62 ...
A penknife might also be used to sharpen a pencil, [3] prior to the invention of the pencil sharpener. In the mid-1800s, penknives were necessary to slice the uncut edges of newspapers and books. [4] A penknife did not necessarily have a folding blade, but might resemble a scalpel or chisel by having a short, fixed blade at the end of a long ...
One step towards determining whether other animals' tool use is likely based on latent solutions or is instead due to cultural evolution of know-how is to determine - for each species examined - whether similar tool use exists in more than one population of the same species, where these populations are culturally unconnected (the so-called ...
At the time of Dixon's death in 1869, the Joseph Dixon Crucible Company was the largest manufacturer of graphite products in the world. By 1870, The Joseph Dixon Crucible Company was the world's largest dealer and consumer of graphite. By 1872 the Dixon company was making 86,000 pencils a day.
One effect of this was that "during World War II rotary pencil sharpeners were outlawed in Britain because they wasted so much scarce lead and wood, and pencils had to be sharpened in the more conservative manner – with knives." [30] It was soon discovered that incense cedar, when dyed and perfumed to resemble Red Cedar, was a suitable ...
A wooden pencil extender. Other implements indirectly associated with writing include erasers for pen and pencil, pencil sharpeners, pencil extenders, inkwells, blotter paper, and rulers and related drawing instruments. Pounce pots were a precursor of blotting paper, being a dispenser for powdery material for drying the paper.
Leonardo da Vinci's Vitruvian Man (c. 1485) Accademia, Venice. Drawing is a visual art that uses an instrument to mark paper or another two-dimensional surface. The instruments used to make a drawing are pencils, crayons, pens with inks, brushes with paints, or combinations of these, and in more modern times, computer styluses with graphics tablets or gamepads in VR drawing software.