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" To look at anything means to place the eye in such a position that the image of the object falls on the small region of perfectly clear vision. This we may call direct vision, applying the term indirect to that exercised with the lateral parts of the... "
The British Journal of Photography - Sida 223
1878
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Popular lectures on scientific subjects, tr. by E. Atkinson. [1st], Volym 1

Hermann Ludwig F. von Helmholtz - 1873 - 424 sidor
...can bring her image to a focus upon the central pit of our retina. Then only are we able to see her. To look at anything means to place the eye in such...retina — indeed with all except the yellow spot. The defects which result from the inexactness of vision and the smaller number of cones in the greater...
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Popular Lectures on Scientific Subjects

Hermann von Helmholtz - 1873 - 432 sidor
...can bring her image to a focus upon the central pit of our retina. Then only are we able to see her. To look at anything means to place the eye in such...retina — indeed with all except the yellow, spot. The defects which result from the inexactness of vision and the smaller number of cones in the greater...
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The Philosophy of Natural Theology: An Essay in Confutation of the ...

William Jackson - 1874 - 432 sidor
...bring her image to a focus upon the central pit of our retina. Then only are we able to see her. " To look at anything means to place the eye in such...— indeed with all except the yellow spot. " The defects which result from the inexactness of vision and the smaller number of cones in the greater...
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The philosophy of natural theology, an essay which obtained a prize at ...

William Jackson - 1874 - 436 sidor
...image to a focus upon the central pit of our retina. Then only are we able to see her. " To I 'in I; at anything means to place the eye in such a position...— indeed with all except the yellow spot. " The defects which result from the inexactness of vision and the smaller number of cones in the greater...
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The Philosophy of Natural Theology: An Essay in Confutation of the ...

William Jackson - 1875 - 452 sidor
...bring her image to a focus upon the central pit of our retina. Then only are we able to see her. " To look at anything means to place the eye in such...indirect to that exercised with the lateral parts of the retina—indeed with all except the yellow spot. " The defects which result from the inexactness of...
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Vision

Christopher Smith Fenner - 1875 - 360 sidor
...eye is like a picture, minutely finished in the centre, but only roughly sketched in at the borders. To look at anything, means to place the eye in such...the small region of perfectly clear vision. This we call direct vision, applying the term indirect to that exercised with the lateral parts of the retina...
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The American Medical Weekly, Volym 8–9

Edwin Samuel Gaillard - 1878 - 604 sidor
...longing for release usually experienced, it seemed to me that I could have sat on without effort. As Helmholtz clearly puts it, " to look at anything means to place the eye in such a position that the imnge of the object falls on the small region of perfectly clear vision. This we may call direct vision,...
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Elementary Physics

Elroy McKendree Avery - 1878 - 480 sidor
...yardFIG. 279. stick. Place the tip of a candle flame opposite one of the divisions of the stick, and place the eye in such a position that the image of the top of the flame will be seen in the direction of the foot of the plumb-line. Mark the point where...
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Popular Lectures on Scientific Subjects

Hermann von Helmholtz - 1883 - 432 sidor
...can bring her image to a focus upon the central pit of our retina. Then only are we able to see her. To look at anything means to place the eye in such...indirect to that exercised with the lateral parts of the retina—indeed with all except the yellow spot. The defects which result from the inexactness of vision...
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Naturalistic Photography for Students of the Art

Peter Henry Emerson - 1890 - 358 sidor
...to see a lark in the sky, Helmholtz says it must be focussed on the central spot. Finally he says, " To look at anything means to place the eye in such a Direct and position that the image of the object falls on the small indirect region of perfectly clear...
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