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.

London : Printed for and sold by the Author, [not before 1762]

2 unnumbered pages, ii, 50, 5 pages, 1 unnumbered page, 1 unnumbered folded leaf of plates : illustrations ; 21 cm (8vo)

The date of this work can be no earlier than 1762, as the 6th ed. of Martin's Philosophical grammar which was published in that year is included in the advertisement

Signatures: [A]2 B-H4

Advertisements on p. [1]-5 at end

Copy 1 Note: Martin's cat. of instruments and books at end mentions transit of Venus, 1761, and 6th ed. of 'Philosophical grammar' (published 1762)

(from t.p.) Containing, I. A practical description of the several sorts of single, solar, and compound microscopes; with their apparatus, and the latest improvements -- II. The nature of vision in insects demonstrated by microscopic observations -- III. A catalogue of all the principal microscopic objects -- IV. The use of the reflecting telescope as an universal perspective for viewing every sort of object in the greatest perfection -- V. The manner of computing the magnifying power in single and double microscopes -- VI. A new method of applying a micrometer to take the dimensions of small objects -- VII. An illustration of the whole in a great variety of figures on a large copper-plate.

ESTC T10172