1, pencil
Pencil is a special pen for writing and sketching, which has a history of more than 400 years. Among them, pencil for sketch is divided into various types, which are divided into three development stages: graphite, wooden pen holder and pencil with cap; In addition, its colors are red and white, black and white, yellow and black stripes.
Generally speaking, "H" means hard pencil, "B" means soft pencil, "HB" means pencil with moderate hardness, and "F" means pencil with hardness between HB and H. ..
2. Water-based pen
Water-based pens are characterized by a spherical nib and a refill that does not suck back ink. After more than ten years of development, they are popular in institutions, companies and universities because of their convenience, cleanliness and smooth writing.
The main solvent of water-based pen is water. Common water-based pens are ballpoint pen, signature pen, plastic, brush pen and highlighter pen. Compared with oil-based pens, water-based pens are tasteless, the nib is not easy to dry, and the writing is light-resistant but not waterproof. When it comes to water, it will be rendered, and if it is accidentally dropped, it will be easy to cut off water.
3. Rubber
Eraser is stationery made of rubber, which can erase traces of graphite or ink. There are many kinds of erasers, with different shapes and colors, including ordinary erasers, special erasers for art, such as 2B, 4B and 6B for painting, and plastic erasers.
Soft polyethylene-based eraser has the texture of plastic, and its function is the same as that of ordinary pink eraser. These erasers are softer than pink erasers, so they are unlikely to damage the paper. Polyethylene rubber is generally white.
4. Ruler
Rulers, also known as rulers and scales, are tools for drawing line segments (especially straight lines) and measuring length. There are usually scales on the ruler to measure the length. Some rulers have holes with special shapes, such as letters or circles, which are convenient for users to draw. They are usually used to measure and calculate the length, and are generally divided into tape measure, vernier caliper, ruler and ruler.
In ruler drawing, ruler is regarded as a tool for drawing infinite straight lines. Level: Level is a measuring instrument that uses the principle of liquid level to directly display the angular displacement and measure the deviation degree of the measured surface relative to the horizontal position, vertical position and inclined position.
5. Pencil Sharpener
Pencil Sharpener is a pencil sharpener and a necessary stationery for students. Pencil Sharpener has single-hole and double-hole design. The golden age of the pencil sharpener is probably from the mid-1980s to the early 1990s. In the early 1990s, automatic or electric pencil sharpeners appeared. The traditional pencil sharpener slowly withdrew from the historical stage.