Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 140
tions of the ellipse andhyperbola in their ordinary forms from these definitions. 71. Mechanical construction of the conies. —The resultsof the last section enable us to construct mechanically theellipse and hyperbola. To construct the ellipse fix two pins at the foci, andplace around them a loop… … An hyperbola may be traced in the following manner :Fix one end of a ruler atone focus, F. A stringwhose length is 2 a less thanthe length of the ruler isattached to the focus F andto the other end of the ruler.A pencil, which holds thestring taut and against the ruler, will trace a branch ofthe…
Geometry, Analytic
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