However small the opening in the lid of a camera obscura be made, still the whole image of the sun will penetrate it.
A remarkable instance of this is recorded by Mr. Myers in an article in the Arena, where the analogy to a camera obscura is very close.
The fact seems to be that there is a kind of invisible camera obscura in Nature, which at odd times gives us glimpses of things happening or existing far beyond the range of our ordinary vision.
The photographic camera, introduced by Daguerre in 1839, adds to the camera obscura some means for adjusting the distance between the lens and the screen on which the image falls.
It is interesting to note this early employment of the camera obscura in the field of astronomical research, in which its latest achievements have been of such pre-eminent value.
We now come to Giovanni Battista della Porta, whose account of the camera obscura in the first edition of the Magia Naturalis, in four books (1558, lib.
In this the description of the camera obscura is in lib.
Quite recently, the camera obscura has come into use with submarine vessels, the periscope being simply a camera obscura under a new name.
The increasing importance of the camera obscura as a photographic instrument makes it desirable to bring together what is known of its early history, which is far more extensive than is usually recognized.
The cameraobscura was first applied to photography (q.
Lucretius lays no claim to original discovery as a philosopher: he professes only to explain, in his native language, 'Graiorum obscura reperta.
As a camera obscura is actually a telescope, magnifying objects in proportion to the focal length of the lens employed, he may be said to have first seen these spots with the aid of an optical instrument.
The preparation is even sensitive enough to permit one to obtain an impression in the cameraobscura in developing by the ferricyanide.
In studying the muscles of animals he invented a {354} dynamometer, he improved spectacles and studied the laws of light, invented the cameraobscura and in his steam experiments anticipated Watt.
Niepce obtained pictures in the camera-obscura upon metal plates coated with asphaltum, or bitumen of Judea.
The images formed by means of a camera-obscura have been found to be too faint to produce, in any moderate time, an effect upon the nitrate of silver.
It was something like this that suggested the camera-obscura to Roger Bacon and Baptista Porta.
Pictures in the camera-obscura could be, not only seen, but caught and retained.
In his explanation of the function of the eye by a comparison with the Camera obscura Leonardo was the precursor of G.
The function of the eye as explained by the camera obscura (70.
From the principle of the transmission of the image to the eye and to the camera obscura he deduces the means of producing an artificial construction of the pyramid of rays or--which is the same thing--of the image.
The function of the eye, as explained by the camera obscura (70--71).
In the summer of 1843, when engaged in some experiments on papers prepared according to the principles of Mr. Talbot's calotype, I had placed in a camera obscura a paper prepared with the bromide of silver and gallic acid.
The Camera Obscura of the Italian philosophers, although highly appreciated, on account of the magical character of the pictures it produced, remained little other than a scientific toy, until the discovery of M.
Illustration] The form of a camera obscura used in a public exhibition is as follows:--D D is a large wooden box stained black in the inside, and capable of containing from one to eight persons.
There are few lovers of art who have looked on the figures or landscapes of a camera obscura without forming the wish that, among the hidden secrets of matter, some means might be discovered for fixing and rendering them permanent.
The lens of the camera obscura transmits the figures to the prepared paper, on quite the same principle on which in vision the crystalline lens conveys them to the retina.
The action of the eye was reduced to that of the camera-obscura described by Da Vinci, and the old notion of rays issuing therefrom finally abandoned.
In the prologue to the Andria he professes to imitate the carelessness of Naevius, Plautus, Ennius, rather than the 'obscura diligentia' of his detractors.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "obscura" in a variety of sentences. We hope that you will now be able to make sentences using this word.
