. Experimental morphology. Protoplasm; Growth. §2] CHEMICAL ACTION OF LIGHT 161 ¥^^ N rays now pass through (4) a Nichol prism (capable of being rotated along- side a graduated arc) set at 45°, in which position both rays pass through without changed relative intensity. The rays emerging from the collecting telescope are now dispersed by passing through the vertically placed prism, and the adjacent parallel spectra are observed through a telescope. By a rotation of the Nichol prism through an observed number of degrees the stronger light may be brought to the intensity of the weaker. The relat
. Experimental morphology. Protoplasm; Growth. §2] CHEMICAL ACTION OF LIGHT 161 ¥^^ N rays now pass through (4) a Nichol prism (capable of being rotated along- side a graduated arc) set at 45°, in which position both rays pass through without changed relative intensity. The rays emerging from the collecting telescope are now dispersed by passing through the vertically placed prism, and the adjacent parallel spectra are observed through a telescope. By a rotation of the Nichol prism through an observed number of degrees the stronger light may be brought to the intensity of the weaker. The relative intensity of two lights with reference to a third (con- stant) is as the squares of the tangent of the angle through which the Nichol prism has been rotated. Other modifications of \o Glan's photometer are those of Lord Rayleigh ('81) and of Lea ('85), upon which the spectrophotometer of the Cambridge (Eng.) Scientific Instrument Co. is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davenport, Charles Benedict, 1866-1944. New York, The Macmillan company; London, Macmillan & co. , ltd.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1897
