This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...sharp, instead of slightly out of focus in appearance, on account of the improved performance of the objective under these conditions. ...Read MoreThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...sharp, instead of slightly out of focus in appearance, on account of the improved performance of the objective under these conditions. Better contrast and increased resolution may also be apparent in the negative, and in fact properly selected colour screens are practically indispensable in photomicrography, and it is essential that their action should be clearly understood in order that the best selection should be made for whatever object is under examination. Absorption Spectra--Monochromatic Light.--The spectra of most radiants consist of a continuous band of colours--violet, blue, green, yellow, orange, and red--grading the one into the other, but if the light is passed through a piece of coloured glass or through a coloured liquid, and then examined by means of a spectroscope, the spectra are found to have quite a different appearance. They are no longer continuous, but broken here and there by dark spaces or "Absorption bands." The bands of colour still remaining depend on the nature of the screen, and may be narrow and almost pure in colour, or broader and show several colours; they sometimes end quite sharply on one or both sides, but in other cases gradually fade away. These bands of colour constitute the "Transmission bands " of the filter in question, and the spectrum made up of coloured bands and dark spaces is called the "Absorption spectrum " of the. dye or colouring matter; if it consists of a single narrow coloured band in any region, the light transmitted by the screen is "Monochromatic." Strictly speaking, this term should refer to light of one wave length, giving a spectrum consisting of one line only, but this is not often obtained in practice, except when the light from an incandescent vapour is ...Read Less
Very good. No dust jacket. Covers are soiled, contents are very good. Has a nice Book Plate from previous owner. 292 p. Includes: illustrations, diagrams, index. 44 Plates, 8 three color photomicrographs, 85 half-tone reproductions and 71 text-illustrations.
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