The spectroscope and its applications / by J. Norman Lockyer.

Date:
1873
Catalogue details

Licence: Public Domain Mark

Credit: The spectroscope and its applications / by J. Norman Lockyer. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    DESCRIPTION OF FRONTISPIECE. I. A Continuous Spectrum, such as is given by the Light FROM Solid, Liquid, and Densely Gaseous Bodies WHEN IN a State of Incandescence. 2—8. Discontinuous Spectra, such as are given by the Light of Gases or Vapours when incandescent. The examples chosen are :— 2. Sodium vapour. 3. Magnesium vapour, showing the lines due to the rarer and denser vapours. 4. Chloride of strontium, an example of the spectrum of a compound body, the finer lines in 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 radiation of sodium, hydrogen, &c. (Tvockyer). 9, 10. Examples of Absorption :— 9. The Solar Spectrum, tracing the dark lines D, C, F, b, &c., to the absorption of sodium vapour, hydrogen, magnesium vapour, &c. 10. The absorption of sodium vapour, shovnng the coincidence of the bright line with the dark line D in the solar spec- trum.