Ultra-Red Radiation Concordance
Ultra-Red Radiation
Section titled “Ultra-Red Radiation”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
38 hits
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3 sources
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10 sections
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Matched Aliases
Section titled “Matched Aliases”Ultra-red radiation, infra-red, infrared, ultra-red, ultrared
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Radiation, Light and Illumination | 31 | 8 |
| General Lectures on Electrical Engineering | 6 | 1 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 1 | 1 |
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Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 3: Physiological Effects Of Radiation - 8 hit(s)
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... ise the lower portions of the speech are not recorded, while at the louder portions the recording point jumps and the voice breaks in the reproduction. 21. The sensitivity of the eye to radiation obviously changes with the frequency, as it is zero in the ultra-red, and in the ultra- violet — where the radiation is not visible — and thus gradually increases from zero at the red end of the spectrum to a maximum somewhere near the middle of the spectrum and then decreases again to zero at the violet end of the spectru ...Lecture 17: Arc Lighting - 6 hit(s)
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... it, though with a sensitive instrument, as a bolometer, we may still be able to measure the heat. All radiations therefore are convertible into heat: the visible light waves as well as the invisible ultraviolet rays, and the — usually more powerful — long ultrared waves ; but none of the radiations can be called heat, no more than the mechanical momentum of a flywheel is heat, because when destroyed, it produces heat. If we consider the infinite range of radiation issuing from heated bodies, we find that those ray ...Lecture 1: Nature And Different Forms Of Radiation - 6 hit(s)
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... they are of frequencies beyond the violet rays of light, they are called " ultra-violet rays/' while the radia- tions which we produced from the heated silicon rods at moderate temperatures were invisible because of too low frequency and are thus called " ultra-red rays," or " infra-red rays/' as they are outside of and below the red end of the range of visible radiation. To produce powerful ultra-violet rays, I use a condenser dis- charge between iron terminals, a so-called ultra-violet arc lamp. Three iron sphere ...Lecture 2: Relation Of Bodies To Radiation - 6 hit(s)
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... of known radiations can be divided into two classes, the electric waves and the light waves, which are separated from each other by the blank space in the middle of the spectrum of radiation (Fig. 14). Under light waves we here include also the invisible ultra-red radiation and the ultra-violet radiation and the non-refrangible radiations, as X-rays, etc., separated from the latter by the second blank space of the radiation spectrum. In the following, mainly the light waves, that is, the second or high frequency range of r ...Lecture 4: Chemical And Physical Effects Of Radiation - 6 hit(s)
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... de and iodide in the negative plate and the quick printing papers. This chemical action is greatest in the violet and ultra-violet and decreases with increasing wave length, hence is less in the green, small in the yellow, and almost absent in the red and ultra-red, so that the short waves, blue, violet and ultra-violet, have sometimes been called " chemical rays." This, however, is a misnomer, just as the term "heat rays" sometimes applied to red and ultra-red rays. In so far as when intercepted they are converted ...Lecture 6: Luminescence - 2 hit(s)
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... rature radiation. The change in the distribution of the power of radiation between the different spectrum lines, with change of tempera- ture, may increase the efficiency of light production — if the lines in the visible range increase faster than in the ultra-red and ultra-violet — or may decrease — if the visible lines in- crease slower — or may increase in some temperature range, decrease in some other temperature range, but all these changes are characteristic of the luminescent material, and do not obey a gen ...Lecture 5: Temperature Radiation - 1 hit(s)
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... lly applied only to abnormally high radiation in the visible range, in its general physical meaning it applies to abnormal radiation of any fre- quency range, and curve V in Fig. 29, for instance, would be the curve of a grey body, which luminesces in the ultra-red, while curve IV would be that of a grey body, in which the heat lumi- nescence is in the visible range. In general, however, it is preferable to consider as luminescence only such radiation as exceeds the black body radiation of the same temperature, an ...Lecture 7: Flames As Illuminants - 1 hit(s)
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... e, how- ever, in the hydrocarbon flame the incandescent radiator is a black body, — carbon, — giving the normal temperature radiation, the radiator of the magnesium flame, magnesia, is a colored radiator, and its radiation is deficient in intensity in the ultra- red, and very high in the visible range, and thereby of a much higher efficiency than given by black-body radiation. The magnesium flame therefore is far more efficient than the hydro- carbon flame, and its light whiter. So also burning aluminum, zinc, phosp ...Lecture 9: Measurement Of Light And Radiation - 1 hit(s)
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... nverted into radiation, as in an incandescent lamp, this method is the most exact. However, it can directly measure only the total radiation power. To measure the different parts of the radiation so as to determine separately the power in the visible, the ultra-red, and the ultra-violet range, the method of input and losses can be used to give the total radiation power, and, by bolometer or other means, the relative powers of the component radiations measured in a beam of light. From the total radiation and the rati ...Chapter 6: Oscillating Currents, - 1 hit(s)
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... than the highest frequencies which can be produced by electrodynamic machinery. At five billion cycles per second, the wave length is about 6 cm., that is, the frequency only a few octaves lower than the lowest frequencies observed as, heat radiation or ultra red light. The average wave length of visible light, 55 X 10~6 cm., corresponding to a frequency of 5.5 X 1014 cycles, would require spheres 10~5 cm. in diameter, that is, approaching molecular dimensions. OSCILLATING-CURRENT GENERATOR. 49. A system of ...