TY  - GEN
T1  - Two essays on the nature and wonderful properties of Island Crystal.Essay I. Containing, all that has been hitherto delivered in regard to its form, dimensions, and double refraction of light; with the addition of several new experiments with polished parallelopipeds and prisms made of this substance, which discover a various, multiple, and colorific refraction; and exhibit a variety of images of one and the same object. To which is subjoined, a computation of the magnifying power of reflecting telescopes; and a table thereof, from 6 inches to 12 feet in length. The whole illustrated with copper plate figures. By Benjamin Martin.
DA  - [1774?]
CY  - London :
AU  - Martin, Benjamin,
PB  - Printed for, and sold by the author, at No. 171, in Fleet-Street,
PP  - London :
PY  - [1774?]
N1  - The second section, with separate titlepage, pagination and register, is 'Essay II. on the nature and wonderful properties of island crystal. ...', with same imprint.
N1  - Both essays could be had separately, the first essay without titlepage.
N1  - Date of publication based on date of advertisement at the end: Just published, The description and use of an opake solare microscope. ... London: printed for the author, No. 171, in Fleet-Street, 1774.
N1  - Price on title page: Price 1s. 6d.
N1  - Reproduction of original from Library of Congress.
ID  - 667881
KW  - Iceland spar
KW  - Telescopes
TI  - Two essays on the nature and wonderful properties of Island Crystal.Essay I. Containing, all that has been hitherto delivered in regard to its form, dimensions, and double refraction of light; with the addition of several new experiments with polished parallelopipeds and prisms made of this substance, which discover a various, multiple, and colorific refraction; and exhibit a variety of images of one and the same object. To which is subjoined, a computation of the magnifying power of reflecting telescopes; and a table thereof, from 6 inches to 12 feet in length. The whole illustrated with copper plate figures. By Benjamin Martin.
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ER  -