Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 1, 2025
To do this, Langley invented a sort of artificial eye, which he called a bolometer, in which the optic nerve is made of an extremely thin strip of metal, so slight that one can hardly see it, which is traversed by an electric current.
Then Kennedy began carefully examining the bolometer and some other recording instruments he had, while the rest of us watched, fascinated. Somehow that "busybody" seemed to attract me. I could not resist looking into it from time to time as Kennedy worked. I was scarcely able to control my excitement when, again, I saw the same scene enacted on the sidewalk before the laboratory.
Boeddicker was unable to detect any appreciable heat at the period of greatest obscuration; but, owing to the extreme sensitiveness of the Bolometer, Mr. Very ascertained that those parts of the surface which had been longest in the shadow still emitted heat "to the amount of one per cent. of the heat to be expected from the full moon."
Reliable determinations of the "energy" of the individual spectral rays were, for the first time, rendered possible by his invention of the "bolometer" in 1880. This exquisitely sensitive instrument affords the means of measuring heat, not directly, like the thermopile, but in its effects upon the conduction of electricity.
This however is the amount of radiation measured by the Bolometer, and to get the temperature of the radiating surface we must apply Stefan's law of the 4th power. Theory of the Moon's Origin.
A long series of experiments at Allegheny was completed in the summer of 1881 on the crest of Mount Whitney in the Sierra Nevada. Here, at an elevation of 14,887 feet, in the driest and purest air, perhaps, in the world, atmospheric absorptive inroads become less sensible, and the indications of the bolometer, consequently, surer and stronger.
"This thing registers some kind of wireless rays infra-red, I think, something like those that they say that Italian scientist, Ulivi, claims he has discovered and called the 'F-rays." "How do you know?" I asked, looking up from my work. "What's that instrument you are using?" "A bolometer, invented by the late Professor Langley," he replied, his attention riveted on it.
As the surface exposed to the Bolometer at each observation is about 1/30 of the moon's surface, and in order to ensure accuracy the instrument has to be directed to a spot lying wholly within the edge of the moon, it is evident that the surface measured has already been for several hours exposed to oblique sunshine. This, Mr.
The mean distance of the moon from the sun being identical with that of the earth, the total amount of heat intercepted must also be identical; only in this case the whole of it reaches the surface instead of one-fourth only, according to Mr. Lowell's estimate for the earth. Now, by the most refined observations with his Bolometer, Mr.
This is a fact formerly conjectured by Faye, and must certainly play a great part in the deformation of the heads of comets. More recently, MM. Nichols and Hull have undertaken experiments on this point. They have measured not only the pressure, but also the energy of the radiation by means of a special bolometer.
Word Of The Day
Others Looking