atus, the magnetic devices are provided for by setting the dif- nation of the blind spot, but the apparatus pictured subject raises the weight three times, in each case ferent indices in accordance with the methods of op- in Fig. 5 is one of the most accurate yet devised. The with his eyes open. A… … dark parts of an imaginary line drawn horizontally illustrations shows an apparatus of the pendulum Apparatns for Measuring Preponderance of Weights. type for the determination of the after-image effect. across the eye and bisecting the pupil. A horizontal An apparatus illustrated on page 164 is…
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