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Updated: June 20, 2025
A very good camera obscura might have been worth so long an ascent in a house redolent of spirits and onions; but after we had reached the top, with a great expenditure of toil and breath, a ragged, shoeless little boy very pompously opened the door of a small wooden erection, and introduced us to four panes of coloured glass, through which we viewed the town of Hamilton, under the different aspects of spring, summer, autumn, and winter!
The parallax of the sun is the angle subtended by the earth's radius at the sun's distance. A. R. Hinks, R.A.S.; Monthly Notices, June, 1909. Ph. The writer considers that it is more likely that these notes refer to a kind of camera obscura, in which a lens throws an inverted image of a landscape on the wall.
This hole will admit the light fast enough, and yet not too fast, and as my plate is sensitized, I can get a picture even if I have no lens. Did you ever see a 'camera obscura, as they call them?" "Oh, you mean one of those things that take a panoramic view of the beach and everything in sight? People get shown up sometimes when they don't know it." "Yes, that's the thing.
"At the earliest period of the employment of the camera obscura, a double-convex lens was used to produce the image; but this form was soon abandoned, on account of the spherical aberration so caused. Lenses for the photographic camera are now always ground of a concavo-convex form, or meniscus, which corresponds more nearly to the accompanying diagram."
It can be received on a sheet of paper or other white surface just as the image of surrounding objects can be thrown upon the white table of the camera obscura.
"You have, perhaps, heard of the Daguerreotype, so called from the discoverer, M. Daguerre. It is one of the most beautiful discoveries of the age. I don't know if you recollect some experiments of mine in New Haven, many years ago, when I had my painting-room next to Professor Silliman's, experiments to ascertain if it were possible to fix the image of the camera obscura.
My Own Extraordinary Premonitions. If clairvoyance partakes of the nature of the camera obscura, by which persons can see at a distance that which is going on beyond the direct range of their vision, it is less easy to suggest an analogy to explain the phenomena of premonition or second sight.
For Heaven's sake take care of him; he is diabolically handsome; he never fails where he sets his heart. Cospetto!" cried the doctor, aloud, as these admonitions shaped themselves to speech in the camera obscura of his brain; "such a warning would have undone a Cornelia while she was yet an innocent spinster."
Yet, though there is no seeing in a dead eye, or in a camera obscura, optics deal exclusively with such inanimate materials; and hence the student who studies them will do well to remember, that optics are the science of vision, with the fact of vision left entirely out of the consideration.
The view from the top was very magnificent, but, as an elevated building offered us one still more extensive, we ascended to the roof by six flights of steps, to see a camera obscura which was ostentatiously advertised.
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