. The microscope; an introduction to microscopic methods and to histology. Microscopes. (« *;> \» Fig. 139. Sensitiveness of the Eye to the Spectrum with Moderate Illumination. (Base Line = Wave lengths X 2S°iOoo times). As shown in this curve the normal human eye with moderate illumination has its maximum sensitiveness at about wave length , that is, in the green next the yellow. With very briUiant light the greatest sensitiveness is in the yellow, while with dim light it moves along well into the green. (See § 406 for designation of wave lengths in microns, etc
. The microscope; an introduction to microscopic methods and to histology. Microscopes. (« *;> \» Fig. 139. Sensitiveness of the Eye to the Spectrum with Moderate Illumination. (Base Line = Wave lengths X 2S°iOoo times). As shown in this curve the normal human eye with moderate illumination has its maximum sensitiveness at about wave length , that is, in the green next the yellow. With very briUiant light the greatest sensitiveness is in the yellow, while with dim light it moves along well into the green. (See § 406 for designation of wave lengths in microns, etc.). Ultra-violet Short radiation invisible to the eye. Compare the sensitive- ness of the photographic plate to this radiation (fig. 140-142). Violet-blue Radiation at the blue end of the spectrum. Green Radiation in the middle of the spectrum. Red Radiation at the red end of the spectrum. Infra-red Long radiation invisible to the eye. G Y Borderland between green and yellow. B G Borderland between blue and green. (2) But as all of these color-sensitive plates are more sensitive to the violet-blue than to the other colors, it is necessary to use some means. >^ (- \ ^(i Fig. 140. Normal Spectrum Showing the Sensitiveness of Ordinary Photographic Plates. (After Mees, and magnified as in fig. 139). As shown in this curve, the ordinary photographic plate is sensitive only in the blue end of the spectrum including the ultra-violet, the maximum sensitiveness being at about wave length It is insensitive to all wave lengths longer than about \ (Compare with fig. 139, 141-142). for reducing or blocking out part of the violet-blue light without interfering with the action of the other colors (§ 367). For gaining. 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 Gage, Simon Henr
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