Light Concordance
Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
2196 hits
Total text matches across processed Steinmetz sections.
13 sources
Sources containing at least one matched alias.
85 sections
Chapters, lectures, sections, or report divisions with matches.
Matched Aliases
Section titled “Matched Aliases”Light, light, luminous, visible light
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Radiation, Light and Illumination | 1600 | 13 |
| General Lectures on Electrical Engineering | 322 | 13 |
| Four Lectures on Relativity and Space | 154 | 4 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 24 | 9 |
| Theory and Calculation of Electric Circuits | 17 | 4 |
| Theoretical Elements of Electrical Engineering | 16 | 8 |
| Theory and Calculation of Alternating Current Phenomena | 15 | 10 |
| Theory and Calculation of Electric Apparatus | 15 | 7 |
| Theory and Calculation of Alternating Current Phenomena | 8 | 5 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 7 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 6 | 2 |
| Theory and Calculation of Alternating Current Phenomena | 6 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 6 | 2 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 17: Arc Lighting - 274 hit(s)
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... e circuit. With the exception of a few of the larger cities, all the street lighting by arc lamps in this country is done by constant current systems, either direct current or alternating current. For direct current constant current supply, separate arc light machines have been built, and are still largely used. In these machines, inherent regulation for constant current is produced by using a very high armature reaction and relatively weak field excitation; that is, the armature ampere turns are nearly equal ...Lecture 12: Illumination And Illuminating Engineering - 257 hit(s)
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LECTURE XII. ILLUMINATION AND ILLUMINATING ENGINEERING. 110. Artificial light is used for the purpose of seeing and distinguishing objects clearly and comfortably when the day- light fails. The problem of artificial lighting thus comprises con- sideration of the source of light or the illuminant; the flux of light issuing from it; ...Lecture 10: Light Flux And Distribution - 226 hit(s)
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LECTURE X. LIGHT FLUX AND DISTRIBUTION. 86. The light flux of an illuminant is its total radiation power, in physiological measure. It therefore is the useful output of the illuminant, and the efficiency of an illuminant thus is the ratio of the total light flux divided ...Lecture 3: Physiological Effects Of Radiation - 171 hit(s)
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... fferences in intensity without measuring them. The photo- graphic camera realizes it. An exposure taken in T^ second with TV opening of the diaphragm in full sunlight usually gives a better photograph than an exposure of 10 minutes at full opening, in the light of the full moon. The ratio of time of exposure in the two cases, however, is about 1 to 1,000,000, thus showing the difference in the intensity of illumination. Also, the disk of the moon, when seen in daylight, has about the same intensity as the sky — ...Lecture 11: Light Intensity And Illumination - 140 hit(s)
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LECTURE XI. LIGHT INTENSITY AND ILLUMINATION. A. INTENSITY CURVES FOR UNIFORM ILLUMINATION. 102. The distribution of the light flux in space, and thus the illumination, depends on the location of the light sources, and on their distribution curves. The character of the ...Lecture 13: Physiological Problems Of Illuminating Engineering - 132 hit(s)
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LECTURE XIII. PHYSIOLOGICAL PROBLEMS OF ILLUMINATING ENGINEERING. 123. The design of an illumination requires the solution of physiological as well as physical problems. Physical considera- tions, for instance, are the distribution of light-flux intensity throughout the illuminated space, as related to size, location and number of light sources, while the relation, to the satisfac- tory character of the illumination, of the direction of the light, its subdivision and diffusion, etc., are phy ...Lecture 9: Measurement Of Light And Radiation - 125 hit(s)
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LECTURE IX. MEASUREMENT OF LIGHT AND RADIATION. 74. Since radiation is energy, it can be measured as such by converting the energy of radiation into some other form of energy, as, for instance, into heat, and measuring the latter. Thus a beam of radiation may be measured by having it ...Lecture 1: Nature And Different Forms Of Radiation - 110 hit(s)
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... energy of the latter is very much greater; a sufficiently sensitive heat-measuring instrument, as a bolometer, shows the heat produced by the interception of the rays of the mercury lamp or the rays of the moon. The most conspicuous form of radiation is light, and, therefore, it was in connection with this form that the laws of radiation were first studied. 1 2 RADIATION, LIGHT, AND ILLUMINATION. 2. The first calculations of the velocity of light were made by astronomers in the middle of the eighteenth c ...Lecture 2: Relation Of Bodies To Radiation - 107 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, ...Lecture 6: Luminescence - 90 hit(s)
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LECTURE VI. LUMINESCENCE. 43. All methods of producing radiation, and more particularly light, other than the temperature radiation or incandescence, are generally comprised by the name luminescence. Some special cases of luminescence have already been discussed in the phe- nomena of fluorescence and phosphorescence, represented by the conversion ...Lecture 2: Conclusions From The Relativity Theory - 75 hit(s)
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... new conceptions are so small that they usually cannot be observed even by the most accurate scientific investigation, and in the few instances where the differences have been measured, as in the disturbances of Mercury's orbit, the bending of the beam of light in the gravitational field, etc., they are close to the limits of observation. 12 CONCLUSIONS FROM RELATIVITY THEORY 13 We have seen that the length of a body and the time on it change with the relative velocity of the observer. The highest velociti ...Lecture 7: Flames As Illuminants - 72 hit(s)
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... n by the conversion of the chemical energy of com- bustion— the flames — and those deriving the energy of radia- tion from electric energy — the incandescent lamp and the arc lamp, and other less frequently used electric illuminants. Flames. To produce light from the chemical energy of combustion, almost exclusively hydrocarbon flames are used, as the gas flame, the candle, the oil lamp, the gasolene and kerosene lamp, etc.; that is, compounds of hydrogen and carbon or of hydrogen, carbon and some oxygen are ...Lecture 8: Arc Lamps And Arc Lighting - 69 hit(s)
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... fi6 0[5 25 1 0 FIG. 45. arc length, I, we get tor every value of current, i, a practically straight line, as shown for the magnetite arc in Fig. 45, for values of current of 1, 2, 4 and 8 amperes. These lines are steeper 137 138 RADIATION, LIGHT, AND ILLUMINATION. for smaller currents, that is, low-current arcs consume a higher voltage for the same length than high-current arcs, the in- crease being greater the longer the arc. These lines in Fig. 45 intersect in a point which lies at I = — 0.12 ...Lecture 5: Temperature Radiation - 59 hit(s)
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... TURE V. TEMPERATURE RADIATION. 34. The most common method of producing radiation is by impressing heat energy upon a body and thereby raising its tem- perature. Up to a short time ago this was the only method avail- able for the production of artificial light. The temperature is raised by heating a body by the transformation of chemical energy, that is, by combustion, and in later years by the trans- formation of electric energy, as in the arc and incandescent lamp. With increasing temperature of a body the ...Lecture 4: Chemical And Physical Effects Of Radiation - 42 hit(s)
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... ody which is responsive to them. The chemical action of radiation is specific to its frequency and seems to be some kind of a resonance effect. We may picture to ourselves that the frequency of vibration of a silver atom is that of violet or ultra-violet light, and therefore, when struck by a wave of this frequency, is set in vibration by resonance, just as a tuning fork is set in vibration by a sound wave of the frequency with which it can vibrate, and if the vibration of the silver atom, in response to the fr ...Lecture 3: Gravitation And The Gravitational Fleld - 38 hit(s)
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... field. The energy field is a storage of energy in space, character- ized by the property of exerting a force on any body susceptible to this energy — that is, a magnetic field on a magnetizable body, a gravitational field on a gravitational mass, etc. Light, or, in general, radiation, is an electromagnetic wave — ^that is, an alternation or periodic variation of the electromagnetic field^ — and the difference between the alternating fields of our transmission lines, the electro- magnetic waves of our radio s ...Lecture 4: The Characteristics Of Space A. The Geometry Of The Gravitational Field - 21 hit(s)
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LECTURE IV THE CHARACTERISTICS OF SPACE A. THE GEOMETRY OF THE GRAVITATIONAL FIELD The starting point of the relativity theory is that the laws of nature, including the velocity of light in empty space, are the same everywhere and with regard to any system to which they may be referred — whether on the revolving platform of the earth or in the speeding railway train or in the space between the fixed stars. From this it follows that the l ...Lecture 1: General - 20 hit(s)
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... me laws of nature apply everywhere. If the laws of nature are the same in the railway train moving at constant speed on straight, level track as they are on the "rigid" platform of the earth or in the empty space among the fixed stars, then the speed of light must also be the same, 186,000 miles per second, and so must be the speed with which the electric current travels in its circuit, which is the speed of light. This is important because all observations depend on it. Any event is either observed by seeing ...