direct-vision spectroscope

noun

, Optics.

1. a simple spectroscope consisting of a collimating lens and an Amici prism.

Word History and Origins

Origin of direct-vision spectroscope¹

First recorded in 1875–80

Example Sentences

In April of this year I was much engaged on the subject of Mr Gill's expedition to Ascension to observe for the determination of the parallax of Mars at the approaching opposition of that planet.—A large Direct-vision Spectroscope has been quite recently made by Mr Hilger under Mr Christie's direction on a new plan, in which either great dispersion or great purity of spectrum is obtained by the use of 'Half-prisms,' according as the incident pencil falls first on the perpendicular or on the oblique face.

From Project Gutenberg