Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 256
to adistant object, closing your left eye and sighting acrossyour finger tip with your right eye. Now keep the fingerin the same position and sight with your left eye. Thefinger will then seem to be pointing to an object somedistance to the right of the one at which you were point-ing. If you can… … 246 THE TEACHING OF GEOMETRY objects, for it will be ten times the estimated distancebetween them. The finding of the reason for this bymeasuring the distance between the pupils of the twoeyes, and the distance from the eye to the finger tip, andthen drawing the figure, is an interesting exercise.…
Geometry
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