Scientific amusements . Fig. 66;—^The Angles 1—4 are equal. be acute, and 3 and 4 obtuse angles. The illusion will be intensified if the diagram be looked at with the right eye. Certain analogous illusions are daily presented to us.^ 78 LIGHT, For instance, an empty room appears smaller than whenfurnished, a papered wall appears larger than a naked wall,a dress striped crossways makes the wearer appear biggerthan when the dress is striped downwards— Fig 67.—The Height o( the Hat. THE HAT EXPERIMENT. A simple amusement consists in requesting some oneto measure the height of your hat
Scientific amusements . Fig. 66;—^The Angles 1—4 are equal. be acute, and 3 and 4 obtuse angles. The illusion will be intensified if the diagram be looked at with the right eye. Certain analogous illusions are daily presented to us.^ 78 LIGHT, For instance, an empty room appears smaller than whenfurnished, a papered wall appears larger than a naked wall,a dress striped crossways makes the wearer appear biggerthan when the dress is striped downwards— Fig 67.—The Height o( the Hat. THE HAT EXPERIMENT. A simple amusement consists in requesting some oneto measure the height of your hat on the wall from thefloor. Generally the person addressed will indicate oneand a half times the actual height if unacquainted withthe trick. In drawing the illustration (Fig. 67) for this VISION AND OPTICAL ILLUSIONS. 79 experiment we were astonished to find that the designreproduced the same illusion. The plinth in the illustra-tion is exactly the same height as the hat, but one wouldscarcely think so when looking at the two objects. Themeasurement can be verified with a compass. THE THREE GREAT MEN. Which is the tallest of the three figures in the annexedillustration ? (Fig. 68.) If you trust only to your eyes you will certainly .reply, Number 3. Well, then, take a graduated scale andmeasure the figures, and you will ascertain that yourvision has been playing you a trick, and that Number iis the tallest of all. M. Viallard, Professor of Physics at
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