The Five Senses of ManH. S. King, 1876 - 304 стор. |
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Результати 1-5 із 45
Сторінка 60
... suppose the whole field of vision to be depicted by a lens , then the image formed by the lens is not thrown upon an even surface , but upon a concave surface , whose centre lies in the lens . This accounts for the lines towards the ...
... suppose the whole field of vision to be depicted by a lens , then the image formed by the lens is not thrown upon an even surface , but upon a concave surface , whose centre lies in the lens . This accounts for the lines towards the ...
Сторінка 62
... Suppose that we are in a room at a little distance from the window , and that we then hold up a finger a few inches before one eye , and close the other ; if we now fix the eye steadily upon the finger so as to see it distinctly , the ...
... Suppose that we are in a room at a little distance from the window , and that we then hold up a finger a few inches before one eye , and close the other ; if we now fix the eye steadily upon the finger so as to see it distinctly , the ...
Сторінка 63
... suppose a luminous point a , fig . II , to be at a certain distance from the eye , then a distinct image of this point will be formed if the retina lies at the point of convergence c ; if , however , the retina is at a greater distance ...
... suppose a luminous point a , fig . II , to be at a certain distance from the eye , then a distinct image of this point will be formed if the retina lies at the point of convergence c ; if , however , the retina is at a greater distance ...
Сторінка 64
... imitated artificially . Let us suppose the eye to be adjusted for a great distance , such as some point upon the horizon , or in the sky . The rays from this point will penetrate the eye in almost parallel 64 THE FIVE SENSES OF MAN .
... imitated artificially . Let us suppose the eye to be adjusted for a great distance , such as some point upon the horizon , or in the sky . The rays from this point will penetrate the eye in almost parallel 64 THE FIVE SENSES OF MAN .
Сторінка 73
... suppose that in a short - sighted eye the image of a luminous point has been formed at B , and that the retina lies behind it at A ; now by making use of a pair of concave spectacles , the image will be formed upon the retina . The more ...
... suppose that in a short - sighted eye the image of a luminous point has been formed at B , and that the retina lies behind it at A ; now by making use of a pair of concave spectacles , the image will be formed upon the retina . The more ...
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Загальні терміни та фрази
action apparatus appear auditory nerve basilar membrane blue body brain called camera obscura cause centimetres cochlea complementary colours consists convex lens distance distinct distinguish double impression ear-bones edge Ernst Heinrich Weber Eustachian tube exactly excited experience fact fenestra ovalis field of vision figure fingers fixed follows fundamental tone greater green hand harmonics Helmholtz illusion imagine incidental images instance irritation layer look manner means motion move muscles number of vibrations observed octave optic nerve outer passes peculiar perceive a double perception phenomena picture position primary colours produced rays of light recognise refraction retina seen sensation of light sense of locality sense of touch sensitive to red sensory circle sensory nerves sensory organs separate points side simultaneously single nerve-fibre skin sound sound-waves spectrum stereoscopic string surface tactile takes place terminal boundaries terminal limits tion tube tuning-fork tympanic cavity tympanic membrane violet vitreous humour whilst
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