Passing through the traveling pinion is a vertical shaft ... between the two connecting lines of said point with the foci of said ellipse. Each of the traveling heads is provided with a flange ...

Sketch the graph of the ellipse \(\ds \frac{x^2}{9}+\frac{y^2}{16}=1\) and determine its foci. Let \(C\) be the conic which consists of all points \(P=(x,y)\) such ...