| Let P be a point outside a circle, let PA be a tangent line, and let PBC be a secant line. |
| There is no necessary connexion between a conical projection and any touching or secant cone. |
| A tangent line may be considered the limiting position of a secant line as the two points at which it crosses the curve approach one another. |
| The secant and cosecant were not used by the early astronomers or surveyors. |
| In this projection the meridians are vertical and parallels having increased spacing in proportion to the secant of the latitude. |
| The oblongs made of any secant from the same point, and of the outter segment of the secant are equall betweene themselves. |
