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The Wonders of Optics — Story, Setting & Ideas
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873
Project Gutenberg
2021
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Physical optics
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en
Edition facts
Words
65,732
Reading time
286 min
Text sections
30
For The Wonders of Optics — Story, Setting & Ideas, the stored edition analysis reports 65,732 words, 4 hr 46 min estimated reading time, and 30 detected text sections.
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Project Gutenberg metadata also associates the work with “Physical optics,” connecting these edition facts with the source record’s subject description.
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Project Gutenberg record #65114
Fulgence Marion's 19th-century popular science work examines vision, light, and optical instruments through vivid descriptions of the eye, prism experiments, and devices like the magic lantern and Fresnel's lighthouse lens, blending technical explanation with historical anecdotes.
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4.9/5
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- Description quality20 pts
- Title & short description10 pts
- Source metadata20 pts
- Text length15 pts
- Chapters / structure15 pts
- EPUB file integrity20 pts
Total of 100 points, scaled to a 2.5-5.0 range. Editions with an empty description or a missing EPUB file are not scored.
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THE STRUCTURE OF THE EYE 22
THE ERRORS OF THE EYE 30
THE APPRECIATION OF COLOUR 44
ILLUSIONS CAUSED BY LIGHT ITSELF 53
THE INFLUENCE OF THE IMAGINATION 60
THE SOLAR SPECTRUM 84
OTHER CAUSES OF COLOUR 94
LUMINOUS, CALORIFIC, CHEMICAL, AND 100 MAGNETIC PROPERTIES OF THE SPECTRUM
THE LAWS OF REFLECTION.—MIRRORS 106
METALLIC BURNING MIRRORS 117
OPTICAL INSTRUMENTS.—THE SIMPLE AND 141 COMPOUND MICROSCOPE. THE SOLAR AND PHOTO-ELECTRIC MICROSCOPE
THE TELESCOPES OF GALILEO, GREGORY, 150 NEWTON, HERSCHEL, LORD ROSSE, AND FOUCAULT
THE MAGIC LANTERN 173
THE PHANTASMAGORIA 183
OTHER OPTICAL ILLUSIONS 196
THE PROPERTIES OF MIRRORS 216
POLYORAMA—DISSOLVING VIEWS—DIORAMA 231
THE CAMERA OBSCURA AND CAMERA LUCIDA 242
SPECTRES—THE GHOST ILLUSION 264
------------------------------------------------------------------------
LIST OF ILLUSTRATIONS.
1. Section of the Eye 24
2. A Camera Obscura 27
3. The Phenakistiscope 54
4. Disc of the Phenakistiscope 55
5. Solar Spectrum Frontispiece
6. Absorption of Light by Sodium Vapour _ib._
7. Action of a Prism on the Solar Rays _ib._
8. The Recomposition of Light 86
9. Recomposition of Light by means of a 87 Concave Mirror
10. Recomposition of Light by means of a 88 number of Mirrors
12. Newton’s Rings 95
13. Reflection from Plane Surfaces 107
15. Experimental Proof of Refraction _ib._
16. The Effects of Plane Mirrors 109
17. Reflection from the Surface of Water 110
18. Concave Mirror 111
19. Conjugate Foci 113
20. Virtual Focus 114
21. Concave Mirror _ib._
22. Magnifying Effect of Concave Mirrors 115
23. The Reversal of real Images _ib._
24. Diminishing Power of Convex Mirrors 116
25. Burning Mirror 124
26. Double Convex Lens 127
27. Forms of Lenses 128
28. Path of a Ray through a Convex Lens 129
29. Path of Divergent Rays through a Convex _ib._ Lens
30. Conjugate Foci 130
31. Images formed by Convex Lenses 131
32. Magnifying Property of Convex Lenses 132
33. Diminishing Effect of Concave Lenses _ib._
34. Cannon of the Palais Royal 134
35. Fresnel’s Lighthouse Apparatus 136
36. Lantern of a First-Class Lighthouse 140
37. The Compound Microscope 143
38. The Theory of the Compound Microscope 144
39. Photo-Electric Microscope 147
40. Solar Microscope 148
41. The Galilean Telescope 155
42. The Astronomical Telescope 156
43. Section of an Astronomical Telescope 157
44. Section of the Gregorian Telescope 160
45. Gregorian Telescope 161
46. Section of a Newtonian Telescope 162
47. Herschellian Telescope 164
48. Foucault’s Large Telescope 169
49. Foucault’s Small Telescope 171
50. Section of the Magic Lantern 179
51. Magic Lantern 182
52. The Phantasmagoria 184
53. The Phantascope 185
54. Phantasmagoria (ROBERTSON) 194
56. Nostradamus and Marie de Médicis 201
57. The Arrangement of the Reversing Prism 203
58. The Goat Trick 205
59. How to see through a Brick 207
60. The Polemoscope 210
61. Protection against ill-natured People 213
64. Effect of Cut Paper-work 225
65. Seditious Toys 229
69. The Principle of the Refracting 239 Stereoscope
70. The Camera Obscura 243
71. Section of Camera Lucida 247
72. The Spectre—an Optical Illusion 269
73. How to produce Spectres 271
------------------------------------------------------------------------
THE WONDERS OF OPTICS.
THE PHENOMENA OF VISION.
THE Eye is at once the most wonderful and the most useful of all our organs of sense. It is especially by means of the eye that we gain a knowledge of the exterior world. Our other senses are far more limited in their action: thus the sense of touch only extends to objects within our reach; the sense of taste is only a delicate and exquisite modification of the sense of touch; the sense of smell can only be exercised on substances that are close to us; and the use of our ears is limited by the distance at which the loudest sound ceases to impress them. But the eye has the privilege of extending its dominion, whether for mere enjoyment or for serious instruction, far beyond the limits of this little world. Not only is it the origin of all our ideas upon every object that comes within its ken; not only does it reveal to us our own position and that of our surroundings; but, thanks to the discoveries of modern science, it is able to admire, on the one hand, a world of infinite minuteness that remained unknown to us for centuries, and, on the other, the immeasurable immensity of the starry universe.
Admirable as the eye undoubtedly is through the possession of the power of vision, it is also capable of enchanting us by its own particular beauties. Not to speak of its internal mechanism, which we shall consider very fully by and by, let us for a moment examine its outward appearance. Have you never, dear reader, been enchanted with a pair of soft and gentle eyes, or with a couple of black orbs veiled with long dark lashes, or
Fulgence Marion’s The Wonders of Optics opens not with a dry definition of light but with a detailed dissection of the human eye, treating the organ as both a biological marvel and an optical instrument. The book’s structure moves from the physiology of vision—the eye’s layers, its errors, and the illusions it can produce—to the physical laws governing light, and finally to a catalogue of devices that manipulate sight: magic lanterns, stereoscopes, and the spectroscope. This three-part arrangement mirrors a progression from the subjective experience of seeing to the objective manipulation of light, with each section anchored by concrete examples rather than abstract theory.
The Eye as an Optical Instrument
The first part of the book treats the eye as a living camera obscura. Marion describes its structure—cornea, lens, retina—in terms borrowed from contemporary optics, comparing the eye’s lens to a glass lens and its focusing mechanism to a bellows. The chapter on optical illusions catalogues phenomena such as afterimages and the persistence of vision, which later reappear in the discussion of the phenakistiscope, a spinning disc that creates the illusion of motion. Marion’s language is precise: he notes that the eye’s ‘errors’—nearsightedness, farsightedness—are not failures but variations in focal length, correctable by lenses. This section establishes a recurring motif: the human body as a site of both limitation and ingenuity.
Prisms, Spectra, and the Composition of Light
In the second part, Marion turns from the eye to the physical properties of light. He explains the solar spectrum through Newton’s prism experiments, but his focus is on practical applications: the absorptive power of sodium vapour, the chemical and magnetic properties of different spectral bands. The translator, Charles W. Quin, adds an original chapter on the spectroscope, a device that splits light into its component wavelengths. Marion’s descriptions are grounded in laboratory practice—he details how to recompose white light using a concave mirror—and he frequently invokes everyday experience, such as the colours seen in a soap bubble, to illustrate interference and diffraction. The tone is that of a patient demonstrator, guiding the reader through each step of an experiment.
Lighthouses, Lenses, and the Scale of Invention
A striking feature of the book is its attention to large-scale optical engineering. Marion devotes several pages to Fresnel’s lighthouse apparatus, a system of concentric lenticular rings that concentrates light into a beam visible for fifty or sixty miles. He describes the octagonal arrangement of lenses, the clockwork rotation that sweeps the beam across the sea, and the use of coloured glasses to distinguish one lighthouse from another. The passage is notable for its specificity: Marion names the port of Havre as the location of a particularly fine example, and he includes a diagram of the lantern interior. This section exemplifies the book’s movement between the microscopic—the structure of the eye—and the monumental, showing how the same principles of refraction govern both.
Magic Lanterns and the Ghost Illusion
The third part, titled ‘Natural Magic,’ collects optical devices that border on entertainment and deception. Marion describes the magic lantern, the phantasmagoria (a moving projection that made ghosts appear to float), and Chinese shadows. He explains how concave mirrors can create real images that seem to hover in mid-air, and he recounts the ‘ghost illusion’—a trick using a hidden lantern and a sheet of glass—that was popular in Victorian parlours. The tone here is more anecdotal; Marion notes that the phantasmagoria was often used to frighten audiences, and he includes a wry observation about Parisians who trust a solar noon cannon over their own watches. This section reveals the book’s dual purpose: to instruct and to amuse, treating optics as both a science and a source of wonder.
Marion’s book is best read as a guided tour of 19th-century optical science, where each device—from the simple lens to the compound microscope—is presented as a solution to a practical problem. The reader should expect frequent digressions into history and anecdote, and the translator’s additions (notably the spectroscope chapter) update the text for an English audience. For those interested in the material culture of science, the detailed descriptions of instruments and their makers offer a valuable record of how light was studied, harnessed, and displayed before the age of electronics.
Reading again about the magic lantern’s painted light, I remembered evenings as a child, lying on the floor where sunbeams broke into softened colour through a glass prism, a hush over the room. This book stirred that same quiet wonder I once felt with Waves and ripples in water, air, and æther — A Reader’s Guide, its patient pages turning invisible movement into something almost touchable, a gentle reminder of how much lives just beyond seeing.
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