Spectrum Concordance
Spectrum
Section titled “Spectrum”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
162 hits
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4 sources
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13 sections
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Matched Aliases
Section titled “Matched Aliases”Spectrum, spectra, spectral, spectrum
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Radiation, Light and Illumination | 125 | 9 |
| General Lectures on Electrical Engineering | 31 | 1 |
| Four Lectures on Relativity and Space | 5 | 2 |
| Theory and Calculation of Electric Circuits | 1 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 2: Relation Of Bodies To Radiation - 51 hit(s)
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LECTURE II. RELATION OF BODIES TO RADIATION. 9. For convenience, the total range 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 spect ...Lecture 6: Luminescence - 33 hit(s)
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... aining mercury, flashes of light are seen in the darkness. This, however, is not real phosphorescence but due to electrostatic flashes of frictional electricity. The light given by fluorescence and phosphorescence of solids or liquids, gives a continuous spectrum, that is, is a mixture of all frequencies, just as is the case with temperature radiation; it differs, however, from temperature radiation by the distribu- tion of the energy in the spectrum, which is more or less charac- teristic of the luminescent body, ...Lecture 17: Arc Lighting - 31 hit(s)
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... which no incandescent lamp can hope -to approach. In the carbon arc, practically all the light comes from the incandescent tips of the carbons, very little from the arc flame. Then by using materials, which in the arc flame give an intense- ly luminous spectrum, the efficiency of \the arc lamp has been vastly improved. So far only three materials have been found, which in luminous arcs give efficiences vastly superior to incandescence : mercury, calcium (lime), and titanium. All (three even in moderate sized u ...Lecture 3: Physiological Effects Of Radiation - 20 hit(s)
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... e 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 spectrum; that is, the physi- PHYSIOLOGICAL EFFECTS OF RADIATION. 41 ological effect produced by the same radiation power — as one wat ...Lecture 5: Temperature Radiation - 5 hit(s)
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... thus changes from red to orange, yellow, yellowish white and then white, the latter at that temperature where all the visible radiations are present in the same propor- tion as in daylight. With still further increase of temperature, the violet end of the spectrum would increase faster than the red end and the light thus shift to bluish white, blue and violet. The invisibility of the radiation of low temperature is not due to low intensity. I have here an incandescent lamp at normal brilliancy. If I decrease the p ...Lecture 7: Flames As Illuminants - 5 hit(s)
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... res, — and this is the case in the flame, — chemical luminescence of the flame gases must be expected in the hydro- carbon flame. It does occur, but does not contribute anything 134 RADIATION, LIGHT, AND ILLUMINATION. to the light production, since the spectra of hydrogen and of carbon (or CO and CH4) are practically non-luminous. The luminescence of the hydrocarbon flame therefore can be observed only with those hydrocarbons which are sufficiently poor in car- bon as not to deposit free carbon, as methane, alc ...Lecture 9: Measurement Of Light And Radiation - 5 hit(s)
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... per- ature rise produced by the energy of the incident beam of radia- tion is observed. Probably the most sensitive method of measuring even very small amounts of radiation is the bolometer. The beam of the radiation (or after dissolving the beam into a spectrum, the wave length of which the power is to be measured) impinges upon a narrow and thin strip of metal, as platinum, and thereby raises its temperature by conversion of the radiation energy into heat. A rise of temperature, however, produces a rise of ele ...Lecture 4: Chemical And Physical Effects Of Radiation - 4 hit(s)
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... obable by the relation which exists between the active frequency range and the weight of the atom or molecule which responds to the radiation. Thus, while the fairly heavy silver atom (atomic weight 108) responds to rays near the violet end of the visible spectrum, the much lighter oxygen atom (atomic weight 16) responds only to much higher frequencies, to those of the physiologically most destructive rays, about one to two octaves beyond the visible spectrum. These very short radiations energetically produce ozone ...Lecture 3: Gravitation And The Gravitational Fleld - 3 hit(s)
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... radius would be: R^ = 1.08 X 10" cm. R = S& X 10>2 cm. = 225,000,000 miles. 68 RELATIVITY AND SPACE electrical constants of the hydrogen atom and showing us the exact rate of its vibration in the spectroscope by the wave length or frequency of its spectrum lines. Thus in a strong gravitational field the frequency of luminous vibrations of the atoms should be found slowed down; in other words, the spectrum lines should be shifted towards the red end of the spectrum. The amount of this shift is so small that ...Lecture 4: The Characteristics Of Space A. The Geometry Of The Gravitational Field - 2 hit(s)
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... ce of radial acceleration, 55 as inertia of accelerated system, 53 laws of, 9, 11, 50 and metric axiom, 110 Gravitational field, 18, 21, 47 and deflection of light, 55, 59 as space curvature, 121 its geometry, 69 intensity, 47 shifting of spectrum lines, 68 Gravitational force as centrifugal force of imaginary velocity, 55 and inertia, 53 Gravitational mass, 47 H in projective Harmonic relation geometry, 108 as non-metric, 110 Hertz, 17, 21 Hyperbolic geometry, 64, 72, 74 Hypersurfa ...Lecture 1: Nature And Different Forms Of Radiation - 1 hit(s)
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... known forms of radia- tion are arranged by their frequency and wave length, and also given in octaves, choosing as zero1 point the middle c of the piano, or a frequency of 128 cycles per sec. UNIVERSITY OF NAT IFFERENT FORMS OF RADIATION. 17 SPECTRUM OF RADIATION. Zero point chosen at c = 128 cycles per second. Speed of radiation S = 3 X lu10 cm. Cycles. Wave Length in Air (or Vacuum). Octave: Q^/ £. Alternating current 1> field: 15 20,000 km. = 12,500 mi. 25 12.000 km. = 7, 500 ...Lecture 12: Illumination And Illuminating Engineering - 1 hit(s)
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... differences increased and made more distinct, or decreased and thus obliterated. For instance, the color resulting from age and dirt is usually the color of carbon and of iron, yellowish brown or reddish brown, that is, colors at the long wave end of the spectrum. Spots and blemishes due to dirt or age, thus are made more distinct by using an illuminant defi- cient in the long waves of light, as the mercury lamp, while in- versely they are decreased by using a reddish-yellow illuminant, as the incandescent lamp or ...Chapter 2: Electric Conduction. Gas And Vapor - 1 hit(s)
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... ed into three distinct types: spark conduction, arc conduction, and true electronic conduction. In spark conduction, the gas or vapor which fills the space be- tween the electrodes is the conductor. The light given by the gaseous conductor thus shows the spectrum of the gas or vapor which fills the space, but the material of the electrodes is imma- terial, that is, affects neither the light nor the electric behavior of the gaseous conductor, except indirectly, in so far as the section of the conductor at the termi ...