Different Colors Of Light Research Articles

THE MOON AS PHOTOGRAPHED BY LIGHT OF DIFFERENT COLORS

THE MOON AS PHOTOGRAPHED BY LIGHT OF DIFFERENT COLORS

On some Early Photographs of the Planets by Light of Different Colours

On some Early Photographs of the Planets by Light of Different Colours

On Photographs of the Brighter Planets by Light of Different Colours. (George Darwin Lecture, delivered 1928 June 8).: (Plates 14-16.)

On Photographs of the Brighter Planets by Light of Different Colours. (George Darwin Lecture, delivered 1928 June 8).: (Plates 14-16.)

On photographs of the brighter planets by light of different colours [George Darwin Lecture

On photographs of the brighter planets by light of different colours [George Darwin Lecture

PHOTOGRAPHS OF SATURN MADE BY LIGHT OF DIFFERENT COLORS

PHOTOGRAPHS OF SATURN MADE BY LIGHT OF DIFFERENT COLORS

Photographs of Mars and of Jupiter taken by light of different colors during 1926

Photographs of Mars and of Jupiter taken by light of different colors during 1926

Photographs of Mars made with light of different colors

Photographs of Mars made with light of different colors

Light Intensity Measurement by Means of Hydriodic Acid

A good deal of reliance seems to have been placed by some investigators in Ecology on the decomposition of dilute solutions of potassium iodide and sulphuric acid in sunlight as a means of measuring light intensity; and as there appeared to be a certain amount of vagueness in the use of these reagents the present investigation was undertaken with a view to placing the subject on a more definite basis, the need for this having arisen out of some other work in hand on photosynthesis. A search through the literature showed that a considerable amount of work had been done on isolated aspects of the subject, the most useful general study being by A. v. Hemptinne (8) (1898), who tried the effect of light of different colours, various concentrations of acid, etc., but whose measurements on the whole are rather limited, and a very complete investigation by Plotnikoff (13) (1907), who, however, studied the reaction from the point of view of the concentration of the oxvgen present in solution. It seemwed worth while to re-study the influence of several factors under conditions which could be fulfilled readily in practice, and this has led, it is believed, to the establishment of some new results and also to the correlation of others which will be mentioned under the specific subject headings. It may be stated at once that the reaction is the oxidation of hydriodic acid by oxygen dissolved in the water (7), whereby iodine is liberated.

Relative sensibility of the average eye to light of different colors and some practical applications to radiation problems

Relative sensibility of the average eye to light of different colors and some practical applications to radiation problems

A Proposed Method for the Photometry of Lights of Different Colors

A Proposed Method for the Photometry of Lights of Different Colors

The relative sensibility of the average eye to light of different colors, and some practical applications to the radiation problems

The relative sensibility of the average eye to light of different colors, and some practical applications to the radiation problems

The relative sensibility of the average eye to light of different colors and some practical applications to radiation problems

The relative sensibility of the average eye to light of different colors and some practical applications to radiation problems

Chromatic Parallax and its Influence on Optical Measurements

The Paper describes various parallax effects observable when objects illuminated by light of different colours are seen through a "pinhole" of smaller diameter than the pupil of the eye. The effects are due to the well-known chromatic aberration of the eye; and it is shown that in most optical instruments of precision the necessary conditions for parallax of this nature are present when observations are made in the blue and violet; and that this results in a serious diminution of the accuracy of such measurements. Several methods of obviating the difficulty are described.

XC. Studies in the photometry of lights of different colours.—IV. The addition of luminosities of different colour

(1912). XC. Studies in the photometry of lights of different colours.—IV. The addition of luminosities of different colour. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 24, No. 144, pp. 845-853.

XCI. Studies in the photometry of lights of different colours.—V. The spectral luminosity curve of the average eye

XCI. <i>Studies in the photometry of lights of different colours</i>.—V. <i>The spectral luminosity curve of the average eye</i>

LXXV. Studies in the photometry of lights of different colours.—III. Distortions in spectral luminosity curves produced by variations in the character of the comparison standard and of the surroundings of the photometric field

(1912). LXXV. Studies in the photometry of lights of different colours.—III. Distortions in spectral luminosity curves produced by variations in the character of the comparison standard and of the surroundings of the photometric field. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 24, No. 143, pp. 744-751.

The Sensitiveness of Selenium to Light of Different Colours.

SOME curious facts about the behaviour of the selenium cell are mentioned in a recent paper by A. H. Pfund.1 The possibility of using these cells for ordinary photometric processes has often been discussed, but there are certain irregu-larities in their behaviour which set a limit to their usefulness.

XXXI. Studies in the photometry of lights of different Colours.—II. Spectral luminosity curves by the method of critical frequency

1. 1. Spectral luminosity curves obtained by the method of critical frequency show a reversed Purkinje effect, but at very low illuminations a true Purkinje effect, the latter observed by Haycraft....

XII. Studies in the photometry of lights of different colours

(1912). XII. Studies in the photometry of lights of different colours. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 24, No. 139, pp. 149-188.

XV. Studies of the phenomena of simultaneous contrast-colour; and on a photometer for measuring the intensities of lights of different colours

(1893). XV. Studies of the phenomena of simultaneous contrast-colour; and on a photometer for measuring the intensities of lights of different colours. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 36, No. 219, pp. 153-175.