pencil

Wood for writing or drawing, thin wood, metal, plastic etc.

Mathematical planes or planes meeting specific equations or conditions by mathematical specific points or series of points

Writing, planning, or temporarily listing pencils with pencils instead of inks:

1350 - 1400; middle English pencel <Chinese French tweezers «Latin pēnicillus painter's brush or pencil, small pēniculus small tail. Penis reference, -cule 1

Pen · CIL · ER; adjective · pen · shield, adjective · pen · shield, adjective such as British, Pennsylvanian, noun · silk

It is made of graphite rod or other marking material and is a thin cylindrical tool for writing, drawing etc. It is usually wrapped in wood and sharpened or fixed with mechanical metallic means

C14: Old French pin cell, Latin pēnicillus painter brush, pēniculus small tail, pēnis tail

Early in the 14th century. "Artist's Camel's Hair Brush" from the old French tweezers "Artist's Brush" (13c., Modern French Tweezers) from Latin Penicillus 'Painter's Brush, Brush', short "Brush" itself is stretch of the "tail" of the penis (see Penis). Before modern pencils and chalk, small brushes were used for writing in the past, but this means that "graphite writing instrument" was clearly developed in the second half of the 16th century. Liyi language pencil promoter "office worker" began in 1881, pencil neck "weak" was first recorded in 1973

It was invented by Harold Grossman in 1967 for the Imperial Pencil Company and later by Arthur D. Little in the 1969s and early 1970s and plastic pencils were commercialized by the Empire as "EPCON" pencil. These pencils were coextruded and the plasticized graphite mixture was extruded into a wood composite core. The core of the pencil is a mixture of finely ground graphite and clay powder. Before mixing the two materials, they are separately removed from the foreign material and dried in such a way as to produce a large square. After the cake is completely dry, mix the graphite and clay cube with water. The amount of clay added to the graphite depends on the expected pencil hardness (the lower proportion of the clay softens the core) and the length of time taken to crush the mixture determines the quality of the lead. The mixture is then formed into a long strip of Italian strip which is straightened, dried, cut and then tempered in a furnace.

Lead in the pencil is made by mixing graphite and clay. Californian cedar trees are dried, dyed and waxed and then sawn into narrow strips of pencils. Place the slats on the feeder and place them on the conveyor. The slat has a flat surface and a semicircular recess along one of the slats. Half of the slats are coated with adhesive and graphite is placed in the slots of these slats. Slats combined with slats without gaps are pushed together and fixed. After drying, remove the pencil from the adhesive. Next, use a knife to cut the pencil into a hexagon so that it will not come off the belt. After that, the pencil was smoothed with a sander and dried with varnish. Then use a metal case called "ferrule" to connect the eraser. Then press the company's logo on a pencil with a heated steel mold