See manuscript’s transcription
Overview of Trigonometria Sphaerica Tractanda per Projectionem in Plano (1679 – 1680)
This manuscript doesn’t concerns directly perspective, but it deals with the projection of a part of a sphere on a plane. However, by doing so Leibniz utilizes a similar method to that of perspective and we believe it could be the key to understand how curves and curved planes are represented in perspective, something that Leibniz always says it is possible to achieve but that he never shows in practice in the manuscripts.