Category: History - Modern (1750+)
When we look with both eyes open at a sphere, or any other solid object, we see it by uniting into one two pictures, one as seen by the right, and the other as seen by the left eye. If we hold up a thin book perpendicularly, and midway between both eyes, we see distinctly the...
When we look with both eyes open at a sphere, or any other solid object, we see it by uniting into one two pictures, one as seen by the right, and the other as seen by the left...
2. CHAPTER II.In order to understand the theory and construction of the stereoscope we must be acquainted with the general structure of the eye, with the mode in which the images of visible o...
3. CHAPTER III.We have already seen, in the history of the stereoscope, that in the binocular vision of objects, each eye sees a different picture of the same object. In order to prove this, w...
4. CHAPTER IV.Although it is by the combination of two plane pictures of an object, as seen by each eye, that we see the object in relief, yet the relief is not obtained from the mere combina...
5. CHAPTER V.Having, in the preceding chapter, described the ocular, the reflecting, and the lenticular stereoscopes, and explained the manner in which the two binocular pictures are combine...
6. CHAPTER VI.In uniting by the convergency of the optic axes two dissimilar pictures, as shewn in Fig. 18, the solid cone MN ought to appear at MN much nearer the observer than the pictures...
7. CHAPTER VII.Although the lenticular stereoscope has every advantage that such an instrument can possess, whether it is wanted for experiments on binocular vision—for assisting the artist by...
8. CHAPTER VIII.However perfect be the stereoscope which we employ, the effect which it produces depends upon the accuracy with which the binocular pictures are prepared. The pictures required...
9. CHAPTER IX.Having described the various forms of the stereoscope, and the method of taking the binocular portraits and pictures to which it is to be applied, we have now to consider the re...
10. CHAPTER X.Having explained the only true method of taking binocular portraits which will appear in correct relief when placed in the stereoscope, we shall proceed in this chapter to point...
11. CHAPTER XI.To the arts of sculpture and architecture, the processes of binocular photography and stereoscopic combination are particularly applicable. The landscape painter has every day w...
12. CHAPTER XII.In treating of those objects of natural history which enter into the composition of landscape scenery, such as trees, plants, and rocks, we have pointed out the method of having...
13. CHAPTER XIII.The observations contained in the preceding chapters prepare us for appreciating the value of the stereoscope as an indispensable auxiliary in elementary as well as in professio...
14. CHAPTER XIV.Every experiment in science, and every instrument depending on scientific principles, when employed for the purpose of amusement, must necessarily be instructive. “Philosophy in...
15. CHAPTER XV.Those who are desirous of having stereoscopic _relievos_ of absent or deceased friends, and who possess single photographic portraits of them, or even oil paintings or miniature...
16. CHAPTER XVI.In a preceding chapter I have explained a remarkable fallacy of sight which takes place in the stereoscope when we interchange the binocular pictures, that is, when we place the...
17. CHAPTER XVII.There are many persons who experience great difficulty in uniting the two pictures in the stereoscope, and consequently in seeing the relief produced by their union. If the eyes...