Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 22, 2025
The whole ring-system, too, appears to be somewhat elliptical. The satellite-theory has derived unlooked-for support from photometric inquiries. Professor Seeliger pointed out in 1888 that the unvarying brilliancy of the outer rings under all angles of illumination, from 0° to 30°, can be explained from no other point of view.
The result of the investigations is that, after allowing for absorption, the heat which comes to the earth corresponds in amount to that inferred from photometric experiments, whereby the experiments made at Paris and at Rome confirm each other.
His photometric catalogue of 4,260 stars, constructed from nearly 95,000 observations of light-intensity during the years 1879-82, constitutes a record of incalculable value for the detection and estimation of stellar variability.
For instance, radiation being nothing but a flux of energy, we could, in order to establish photometric units, divide the normal spectrum into bands of a given width, and measure the power of each for the unit of radiating surface. But, notwithstanding some recent researches on this question, we cannot yet consider the distribution of energy in the spectrum as perfectly known.
As it was of interest to ascertain what the increase of illuminating power was in a given lamp provided with the new chimney, Mr. Felix le Blanc undertook some photometric experiments. The trials were made with a Gagneau lamp provided with a chimney of the ordinary shape, and then with one of Mr. Bayle's. The measurements were made after each had been burned half an hour.
Word Of The Day
Others Looking