Optical essays, containing, I. A practical description of the several sorts of ... microscopes ... II. The nature of vision in insects ... III. A catalogue of ... microscopic objects. IV. The use of the reflecting telescope ... V. The manner of computing the magnifying power in ... microscopes. VI. A new method of applying a micrometer, etc / By B. Martin.

Licence: Public Domain Mark

Credit: Optical essays, containing, I. A practical description of the several sorts of ... microscopes ... II. The nature of vision in insects ... III. A catalogue of ... microscopic objects. IV. The use of the reflecting telescope ... V. The manner of computing the magnifying power in ... microscopes. VI. A new method of applying a micrometer, etc / By B. Martin. Source: Wellcome Collection.