Chromatography, or, A treatise on colours and pigments : and of their powers in painting, &c. (1835)
Field, George, 1777?-1854 · London : C. Tilt · leaf 256
circle above it, a circular spectrum will ap-pear expanding as the instrument rises, but not two, as in Exp. iv., becausethe second iris being beyond the field of vision and angle of refraction ofthe instrument, never enters it. The visible spectrum of this experiment ishowever more beautiful and… … fig. 11. Remarks.—The spectra in these experiments will not afford perfect cir-cles and distinct colours, unless the glass, of which the lensic prisms areformed, is perfectly free from veins, and of uniform density. Native crystalgives perfect circles, but refracts with too little power to afford…
Color · Pigments · Painting
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