Two essays on the nature and wonderful properties of Island crystal
Subtitle: the whole illustrated with copper plate figures
By: by Benjamin Martin
Publisher: Printed for, and sold by the author ...
Published: 1774
Place of publication: London
Language: eng
Number of pages: 18
Subjects: Iceland spar; Optical properties; Early works to 1800; Telescopes
Notes: Signatures: [A]1 B-C⁴ ²B⁴; B-C⁴ [D]1.

Pt. 2 has separate signatures and paging and special t.p.

Advertisement at end dated 1774.
Table of contents: title: (from t.p.'s) Essay I: containing all that has been hitherto delivered in regard to its form, dimensions, and double refraction of light. To which is subjoined, A computation of the magnifying power of reflecting telescopes; title: Essay II: on the nature and wonderful properties of Island crystal.