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But darken a chamber and let a single pencil of rays in through a key-hole, then you have a picture on the wall. We never fall in love with a woman in distinction from women, until we can get an image of her through a pin-hole; and then we can see nothing else, and nobody but ourselves can see the image in our mental camera-obscura.
He treated of the conditions of descent of bodies along inclined planes and circular arcs, invented the camera-obscura, discussed correctly several physiological problems, and foreshadowed some of the great conclusions of modern geology, such as the nature of fossil remains, and the elevation of continents. He explained the earth-light reflected by the moon.
It is greatly to his credit that he discovered the scientific principle of this phenomenon, and by means of it constructed a camera-obscura, or magic-lantern, out of a hollow box. This was of great advantage to him in drawing landscapes.
Before the day of the telescope, he had viewed the image of the sun as thrown on a screen in a camera-obscura, and had observed a spot on the disk which be interpreted as representing the planet Mercury, but which, as is now known, must have been a sun-spot, since the planetary disk is too small to have been revealed by this method.
But where the shadows or dark parts of the camera-picture fall, the sensitive coating is less darkened, or not at all, if the shadows are very deep, and so these shadows of the camera-picture become the lights of the glass-picture, as the lights become the shadows. Again, the picture is reversed, just as in every camera-obscura where the image is received on a screen direct from the lens.
Notwithstanding the incalculable minuteness of his execution, the touch of his brush is free and soft, and his best pictures look like Nature seen through the camera-obscura. His works were so highly estimated in his own time, that the President van Spiring, at the Hague, offered him 1000 florins a year for the right of pre-emption of his pictures.
As we have seen this process, a closet is arranged as a camera-obscura, and the enlarged image is thrown down through a lens above on a sheet of sensitive paper placed on a table capable of being easily elevated or depressed.
But darken a chamber and let a single pencil of rays in through a key-hole, then you have a picture on the wall. We never fall in love with a woman in distinction from women, until we can get an image of her through a pin-hole; and then we can see nothing else, and nobody but ourselves can see the image in our mental camera-obscura.
And then consider what mere Time will do in such cases; how if a man was great while living, he becomes tenfold greater when dead. What an enormous camera-obscura magnifier is Tradition! How a thing grows in the human Memory, in the human Imagination, when love, worship and all that lies in the human Heart, is there to encourage it.
But darken a chamber and let a single pencil of rays in through a key-hole, then you have a picture on the wall. We never fall in love with a woman in distinction from women, until we can get an image of her through a pin-hole; and then we can see nothing else, and nobody but ourselves can see the image in our mental camera-obscura.
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