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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![LIST OF ILLUSTRATIONS. 6 tAGF. FIG. 1. Geometrical form of the prism 2 2. Prism mounted on a stand 3 3. Refraction of light 5 4. Explanation of the bent stick 6 5. Refraction of light. Apparent elevation of the bottoms of vessels 7 6. Light passing through plate of glass 8 7. Deviation of luminous rays by prisms 9 8. Images of objects seen through prisms ' lo 9. Decomposition of light by the prism. Unequal refrangi- bility of the colours of the spectrum *. . . 11 10. Recomposition of white light by means of a second prism . _ . 14 11. Recomposition of white light by means of a rapidly revolving disc, coloured in sectors 15 12. Left-hand diagram, solar spectrum near D; right-hand dia- gram, solar spectrum near e 20 13. Cljemica! or stui ent's spectroscope 26 14. Spectio.scope with two prisms 27 15. Steinheil's form of four-prism spectroscope : arrangement of slit shown separately 28 16. Spectroscope with reflected scale 29 17. Huggins's star spectroscope 31 18. Direct-vision prism with three prisms, showing path of ray. . 34 19. Direct-vision prism with five prisms ' • • • 35 20. Electric lamp 38 21. Arrangement of the electric lamp used for rapid comparisons . 39 22. Bunsen's burner for flame s-pectra . 42 23. Mitscherlich's arrangemetit for flame spectra 43 24. Herapath's blow-pipe 44 25. Arrangement for determining the spectra of metals by means of the electric spark, showing induction coil, Leyden jar, . and spark stand 46 26. The electric arc 47 27. Geissler's tube, showing electric discharge 48 28. Side view of star spectroscope, showing the anangement by which the light from a s])ark is thrown into the instrument by means of the reflecting prl^m by a mirror 58](https://iiif.wellcomecollection.org/image/b21976752_0019.jp2/full/800%2C/0/default.jpg)
