Illustration depicting different types of two-dimensional curves on a plane, including spiral, plane lemniscate, and concentric circles. These plane curves are top views (projections) of the three-dimensional space curves classified by chemist Edward G. Mazurs in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). In the space curve model, symbols of the elements are placed on the three-dimensional curves as points and the lines of the cylinder or cone are used to connect related elements. These illustrations appear as Figure 2 on page 98 of Mazurs' 1957 publication.
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