The Spectroscope and Its Applications |
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... blue - green being alone due to the metallic strontium . 5. Hydrogen at high pressure . 6. Hydrogen at low pressure . 7. Spectrum of a Nebula ( Huggins ) . 8. Spectrum of the Sun's Chromosphere , tracing the bright lines to the ...
... blue - green being alone due to the metallic strontium . 5. Hydrogen at high pressure . 6. Hydrogen at low pressure . 7. Spectrum of a Nebula ( Huggins ) . 8. Spectrum of the Sun's Chromosphere , tracing the bright lines to the ...
Page 12
... blue till it becomes a pure blue , then indigo , and finally ends with a violet colour . The transition from one colour to another is not abrupt , but is made in an imperceptible manner , so that it can scarcely be said , for instance ...
... blue till it becomes a pure blue , then indigo , and finally ends with a violet colour . The transition from one colour to another is not abrupt , but is made in an imperceptible manner , so that it can scarcely be said , for instance ...
Page 13
... blue deflected to a certain other distance . You see by this experiment that there is a distinct difference in the amount of refran- gibility that the red light is not diverted so far out of its original direction by the prism as the blue ...
... blue deflected to a certain other distance . You see by this experiment that there is a distinct difference in the amount of refran- gibility that the red light is not diverted so far out of its original direction by the prism as the blue ...
Page 17
... blue , or yellow , or any other single colour.✓ Hitherto we have spoken only of refraction . I now introduce the word dispersion , which repre- sents simply a measure of different refractions , or the difference between the bending of ...
... blue , or yellow , or any other single colour.✓ Hitherto we have spoken only of refraction . I now introduce the word dispersion , which repre- sents simply a measure of different refractions , or the difference between the bending of ...
Page 18
... a slit , we obtain a spectrum of the greatest purity ; the red , blue , green , and violet , instead of overlapping and destroying the beauty of the spectrum , show distinctly as simple colours 18 [ LECT . THE SPECTROSCOPE.
... a slit , we obtain a spectrum of the greatest purity ; the red , blue , green , and violet , instead of overlapping and destroying the beauty of the spectrum , show distinctly as simple colours 18 [ LECT . THE SPECTROSCOPE.
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Common terms and phrases
absorption lines absorption spectrum Aldebaran application arrangement astronomers atmosphere band black lines blue bright lines Bunsen chromosphere coincident collimating lens colour comet continuous spectrum dark lines deal dense determine direct-vision dispersion electric lamp examine experiment F line fact flame Fraunhofer lines gas or vapour gaseous gases give glass green Huggins hydrogen lines important Induction Coils instance instrument iron Kirchhoff lens line of hydrogen lithium magnesium vapour metal minimum deviation nebula Newton NORMAN LOCKYER number of prisms observing telescope obtained Orionis pass perfectly easy pressure Professor prominences radiation rainbow band ray of light refracted refrangibility Science scientific seen showing shown in Fig slit sodium lines sodium vapour solar prominences solar spectrum solid or liquid spec spectra spectrum analysis Spectrum of carbon star spectroscope strontium substances sun-spot sunlight surface thing three prisms trum tube velocity violet visible white light Wollaston yellow
Popular passages
Page 96 - When this light was allowed to fall through a suitable flame coloured by common salt, dark lines were seen in the spectrum in the position of the sodium lines.
Page 94 - I obtained a tolerably bright solar spectrum, and brought a flame coloured by sodium vapour in front of the slit. I then saw the dark lines D change into bright ones.