Skiascopy and its practical application to the study of refraction . or turned to the right, the central erect area being dis-placed toward the left, and the peripheral inverted area to-ward the right of the space it occupies. Figure 16 repre-sents the light areas displaced in the opposite directions byan opposite inclination of the mirror. With the concave mirror, a similar series of changesmay be brought about by placing before the e3re successivestrengths of the lenses, beginning with the weakest convexor strongest concave. The first should allow the points ofreversal for all parts of the p
Skiascopy and its practical application to the study of refraction . or turned to the right, the central erect area being dis-placed toward the left, and the peripheral inverted area to-ward the right of the space it occupies. Figure 16 repre-sents the light areas displaced in the opposite directions byan opposite inclination of the mirror. With the concave mirror, a similar series of changesmay be brought about by placing before the e3re successivestrengths of the lenses, beginning with the weakest convexor strongest concave. The first should allow the points ofreversal for all parts of the pupil to be back of the observer,and the successive changes bring these points closer andcloser to the observed eye until all are in front of the ob-server. The movement is at first against the light on theface. Then appears the ring of illumination and swift THE APPEARANCES OF POSITIVE ABERRATION. 61 movement in the margin of the pupil with the light onthe face. The central area of light is then encroachedupon by the ring of faint illumination, and this in turn by.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectretinos, bookyear1896
