"Dioptric" Quotes from Famous Books
... in plan an ordinary Fresnel's dioptric fixed light apparatus, and BB' a hemispherical mirror (either metallic or dioptric on my father's principle) which is made to revolve with uniform speed about the burner. This mirror, it is obvious, intercepts ... — The Works of Robert Louis Stevenson - Swanston Edition Vol. XXII (of 25) • Robert Louis Stevenson |