LIST OF ENGRAVINGS.
| Figure | Page | |
| [1.] | Representation of the diminution of the intensity of light. | 22 |
| [2.] | Illustrative of the refraction of light. | 43 |
| [3.] | Representing the angles of incidence and refraction. | 44 |
| [4.] | The refraction of the atmosphere. | 51 |
| [5.] | Various forms of lenses. | 65 |
| [6,] | [7,] [8.] Parallel, converging, and diverging rays. | 66 |
| [9,] | [10,] [11.] Passage of parallel, diverging, and converging rays through convex lenses. | 67 |
| [12.] | Passage of parallel rays through concave lenses. | 69 |
| [13.] | Images formed by convex lenses. | 71 |
| [14.] | Angle of incidence and reflection. | 83 |
| [15.] | Images as reflected from a plane mirror. | 84 |
| [16.] | Illustrative of reflections from a plane mirror. | 85 |
| [17.] | Shewing how the image in a plane mirror is twice the length of the object. | 86 |
| [18.] | Reflection from concave mirrors. | 87 |
| [19.] | Reflection from convex mirrors. | 89 |
| [20.] | Parallel rays as reflected from concave mirrors. | 91 |
| [21.] | Diverging rays as reflected from concave mirrors. | 91 |
| [22.] | Images formed before concave mirrors. | 93 |
| [23.] | Images formed behind concave mirrors. | 96 |
| [24.] | Illustrating the magnifying power of concave mirrors. | 97 |
| [25.] | Inverted images formed in the front of concave mirrors. | 98 |
| [26.] | Illustrative of deceptions produced by concave mirrors. | 100 |
| [27,] | [28.] Experiment with a bottle half filled with water. | 101 |
| [29.] | Effect of extraordinary refraction on ships at sea. | 109 |
| [30.] | Experiment for illustrating the causes of uncommon refraction. | 117 |
| [31.] | Prismatic spectrum. | 127 |
| [32.] | Different foci of coloured rays in convex lenses. | 129 |
| [33.] | Experiment to show the different foci of red and violet rays. | 129 |
| [34.] | Illustrative of the prismatic colours. | 136 |
| [35.] | Explanatory of refraction and reflection from drops of rain. | 147 |
| [36.] | Explanatory of the rainbow. | 149 |
| [37.] | Images of objects formed in a dark chamber. | 187 |
| [38.] | The revolving Camera Obscura. | 194 |
| [39,] | [40.] The portable Camera Obscura. | 195, 196 |
| [40,]* | [41,] [42.] Illustrative of the angle of vision, and the apparent magnitude of objects. | 206, 207, 208 |
| [43.] | The Galilean telescope. | 215 |
| [44.] | The astronomical telescope. | 218 |
| [45,] | [46.] The aerial refracting telescope. | 226 |
| [47.] | The common refracting telescope. | 228 |
| [48,] | [49,] [50.] Manner in which the rays of light are refracted in telescopes. | 231 |
| [51.] | Telescope with a single lens. | 234 |
| [52.] | Illustrative of spherical aberration. | 236 |
| [53.] | Illustrative of the principle of achromatic telescopes. | 241 |
| [54,] | [55.] Double and treble achromatic object-glass. | 242 |
| [57.] | Common stand for achromatic telescopes. | 260 |
| [58.] | Equatorial stand for achromatic telescopes. | 262 |
| [59.] | Dollond’s stand for achromatic telescopes. | 264 |
| [60.] | Blair’s fluid achromatic object-glass. | 271 |
| [61.] | Barlow’s fluid telescope. | 274 |
| [62,] | [63,] [64,] [65,] [66.] Various forms of reflecting telescopes. | 288 |
| [67.] | Gregorian reflecting telescope. | 293 |
| [69.] | The aerial reflector. | 313 |
| [70.] | Front view of the aerial reflector. | 314 |
| [71.] | Construction of large reflecting telescope. | 322 |
| [72.] | Reflecting telescope with a single mirror. | 332 |
| [73.] | Huygenian eye-piece. | 336 |
| [74.] | Ramsden’s eye-piece. | 339 |
| [75,] | [76.] Combination of lenses for achromatic eye-pieces. | 340 |
| [77,] | [78.] Diagonal eye-pieces. | 344, 345 |
| [79.] | Terrestrial eye-piece with four lenses. | 349 |
| [80.] | Eye-piece of an old Dutch achromatic telescope. | 356 |
| [81.] | Pancratic eye-piece. | 359 |
| [82.] | Manner of exhibiting the solar spots. | 384 |
| [84.] | Mode of measuring distances from one station. | 430 |
| [85.] | Cavallo’s micrometer. | 446 |
| [86.] | The equatorial telescope, or portable observatory. | 455 |
| [87.] | Figure to illustrate the principle of the quadrant. | 491 |
| [88.] | The astronomical quadrant. | 493 |
| [89.] | The astronomical circle. | 496 |
| [90.] | The transit instrument. | 502 |
| [91.] | Plan of a private observatory. | 511 |
| [92.] | Rotatory dome for an observatory. | 513 |
| [93.] | Wheel-work of a planetarium. | 521 |
| [94.] | Perspective view of a planetarium. | 522 |
| [95.] | Apparatus for exhibiting the retrograde motions of the planets. | 525 |
| [96.] | Section of the wheel-work of Dr. Henderson’s planetarium. | 528 |
| [97.] | Thirteen views of the supposed form of Saturn’s ring. | 539 |
| [98.] | Earl of Rosse’s Great Telescope. | 559 |
| [99.] | Section of the machinery connected with the telescope. | 560 |
| [100.] | Perspective view of the author’s observatory—to front the title. |
THE
PRACTICAL ASTRONOMER.