THE MAGIC TELESCOPE.
The following, although requiring considerable skill in joining, can readily be made by any boy of fifteen, if he is at all skillful in the use of carpenter’s tools, and has a fair endowment of those two excellent qualities, patience and perseverance, so absolutely indispensable to success in almost any undertaking.
This telescope consists of a series of square wooden tubes, with an inside diameter of about five inches, so carefully joined together that no ray of light can find its way in through the crevices. The oblique lines are pieces of looking-glass, with their faces turned toward each other. Now, by placing the eye at E, of course it would seem that anything at H could be seen directly through the tubes A B, while if a book or other opaque object be interposed, as shown in Fig. 2, it would seem equally a matter of course that the view would be obstructed; this, however, is not the case, as the mirrors reflect the object through the tube and it appears as plainly as when the book is removed.
To those unfamiliar with its construction this magic telescope, by which you apparently see through a solid substance, is an unfailing source of wonder.
The object at H should be quite brilliantly lighted, as some of the rays are absorbed in the passage of the reflection through the tube; especial care should also be taken to place the mirrors at a slant, exactly midway between the horizontal and the upright, or, to speak more scientifically, at an angle of 45 degrees to the line of the tubes.
The tubes A and B should not be so far apart at the place where the book is inserted as to permit the backs of the mirrors to be easily seen.
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