Reciprocal-Polar Linearization and Two Conic Constructions for the Cone Projection

Let $$f_R(x)=\frac{x}{1+\text{norm}x\mathrm{/}R},R>0,$$ be the radial cone projection of the plane onto the open disk $\text{DR}=\{x:\text{norm}x<R\}$. Previous work established the Self-Directrix and Confocal-Codirectrix Theorems, according to which $f_R$ maps focal conic arcs to focal conic arcs while preserving the distinguished focus and directrix. This note combines those results with three classical facts recorded by W.~H.~Besant. First, reciprocal polarity with respect to $\mathrm{\partial }\text{DR}$ represents every focal conic under consideration as the reciprocal polar of a unique circle, and in this circle representation the nonlinear action of $f_R$ becomes the elementary radius translation $q\mapsto q+R$. Second, the normals at the intersections of a fixed ray with the self-directrix family envelope an explicit parabola. Third, the tangent at $f_R(z)$ is constructed directly from the original point $z$ and the original line, without differentiating $f_R$ or solving for the conic.