Abstract
STUDENTS of geometrical conies should not fail to-provide themselves with this accurately made and handy little “Conic Template.” By merely passing a pencil round its curved edges, a true ellipse, parabola, and hvperbola can be drawn, the three curves having closely related elements, which are specified in the instructions accompanying each instrument. The regular employment of accurate figures, instead of rough diagrams sketched freehand, will add interest to the work, and will materially assist in fixing on the mind of the student the forms and properties of these important curves.
Conic Template.
J. T. Dufton's design. For Junior Students of Conies. (London: Macmillan and Co., Ltd.) Price, nickel-plated metal, 4d. net; transparent celluloid, 8d. net.
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Conic Template . Nature 87, 482 (1911). https://doi.org/10.1038/087482c0
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DOI: https://doi.org/10.1038/087482c0