Microscopium pantometricum; or, A New Construction of a Micrometer, adapted to the compound and solar Microscope: shewing by inspection, I. The Magnifying Power of the Object Lenses, and of the Eye-Glasses. II. The Extent of the Field of View. III. The Dimensions of the Real and Apparent Magnitude of small Objects. To which is added, The Description of an Universal Perspective, with a Scale of all its Magnifying Powers. The Whole illustrated by Two Copper Plates. By B. Martin.

Date:

[1780?]