| 摘要 |
School supply - universal consists of : a) a circle, partly cut in diameter (1), decimal scale on the brim (vernier) (3), perforations (12) for drawing circles. b) A square (19) with a round opening in its centre, the same as the circle (18) and one or more concentrically positioned scales; the internal circle "rides" on the external, and has as many verniers as the square has scales. There is a scale on the edges of the square. The internal circle is pressed into the square like a snap fastener. They turn inside and around each other (circumscribe the line that divides them physically and connects them functionally) in the same level. Addition to the supply is a ruler, which can be used to draw the parallel lines operating together with the square and has perforations (5, 6) for drawing circles. This school supply can be used for drawing in Indian ink too. This school supply has a digital scale reader (15). A small computer, it offers even more possibilities.
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