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" ... each side, make two marks ; then place yourself directly opposite to the paper, and hold the end of your finger before your face in such a manner, that when the right eye is open, it shall conceal the mark on the left, and, when the left eye is open,... "
Recreations in mathematics and natural philosophy, recomposed by m. Montucla ... - Page 291
by Jacques Ozanam - 1840
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A Compleat System of Opticks in Four Books, Viz. A Popular, a ..., Volume 2

Robert Smith - 1738 - 450 pages
...the left eye the right mark. If you remain firm in thatpofture, and look ftcadily with both eyes on the end of your finger, the paper which is not at all covered thereby, will totally difappear. Which is the more furprifing, becaufe without this particular...
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Recreations in Mathematics and Natural Philosophy ...

Jacques Ozanam - 1803 - 596 pages
...mark on the left, and, when the left eye is open the mark on the right; if you then look with both eyes to the end of your finger, the paper, which is...eye, and hence the disappearance of the object from both. PROBLEM XV. s An optical game, which proves that with one eye a cannet judge well of the distance...
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A sequel to the Endless amusement. To which are added, Recreations with cards

Endless amusement - 1825 - 226 pages
...mark on the left, and when the left eye is open, the mark on the right : if you then look with both eyes to the end of your finger, the .paper, which...either of your eyes, will nevertheless disappear. Another singular Experiment. Fix, at the •height of the eye, on a dark ground, a small round piece...
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The Boy's Own Book;: A Complete Encyclopedia of All the Diversions, Athletic ...

William Clarke - 1829 - 476 pages
...mark on the left, and, when the left eye is open, the mark on the right : if you then look with both eyes to the end of your finger, the paper, which is...either of your eyes, will, nevertheless, disappear. Fix, at the height of the eye, on a dark ground, a small round piece ot white paper, and a little lower,...
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A London Encyclopaedia, Or Universal Dictionary of Science, Art ..., Volume 16

Thomas Curtis - 1829 - 824 pages
...mark on the left, and, when the left eye is open, the mark on the right : if you then look with both eyes to the end of your finger, the paper, which is...either of your eyes, will nevertheless disappear. 515. The general effect of the camera obscura is the same as may often be observed in a dark room,...
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The Penny Mechanic, and the Chemist, Volume 2

1837 - 800 pages
...conceal the mark on the left, and, when the left eye is open, the right ; if you then look with both eyes to the end of your finger, the paper, which is...either of your eyes, will, nevertheless, disappear. \VM K — H. The Glowworm. — The glowworm possesses the curious property of causing its light to...
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The Boy's Own Book: A Complete Encyclopedia of All the Diversions Athletic ...

William Clarke - 1849 - 646 pages
...mark on the left, and when the left eye is open, the mark on the right : if you then look with both eyes to the end of your finger, the paper, which is not at all coneealed by it from either of your eyes, will, nevertheless, disappear. ANOTHEE Fix, at the height...
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Boy's Own Book Extended: A Complete Encyclopedia of All Athletic, Scientific ...

William Clarke - 1855 - 722 pages
...open, tlie mark on tlie right ; if you then look with both cye» to U«- end of your linger, thenapcr, which is not at* all concealed by it from either of your eyee, will, ncvertitelesB, dUap|>ear. ANOTHER. Fix, at the height of the eye, on a dark ground, a small...
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The Boy's Own Book: A Complete Encyclopædia of Sports and Pastimes ...

William Clarke - 1880 - 770 pages
...the mark on the left, and when the left eye is open the mark on the right. If you then look with both eyes to the end of your finger, the paper, which is...not at all concealed by it from either of your eyes, Trill disappear. 2. Fix, at the height of the eye, on a dark ground, a small round piece of whits paper,...
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Sunshine

Amy Johnson - 1894 - 604 pages
...and when your left is open it shall hide the mark on the right. Look with both eyes at the end of the finger. The paper, which is not at all concealed by...either of your eyes, will nevertheless disappear. 150. Astigmatism. — The eye is not equally "in focus" for horizontal and vertical lines at the same...
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