2 Sentences With "ellipsographs"

How to use ellipsographs in a sentence? Find typical usage patterns (collocations)/phrases/context for "ellipsographs" and check conjugation/comparative form for "ellipsographs". Mastering all the usages of "ellipsographs" from sentence examples published by news publications.

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Central projection of circles (gate) Ellipses appear in descriptive geometry as images (parallel or central projection) of circles. There exist various tools to draw an ellipse. Computers provide the fastest and most accurate method for drawing an ellipse. However, technical tools (ellipsographs) to draw an ellipse without a computer exist.
The principle of ellipsographs were known to Greek mathematicians such as Archimedes and Proklos. If there is no ellipsograph available, one can draw an ellipse using an approximation by the four osculating circles at the vertices. For any method described below, knowledge of the axes and the semi-axes is necessary (or equivalently: the foci and the semi-major axis). If this presumption is not fulfilled one has to know at least two conjugate diameters.