Brilliancy Concordance
Brilliancy
Section titled “Brilliancy”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
66 hits
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2 sources
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11 sections
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Matched Aliases
Section titled “Matched Aliases”Brilliancy, brilliancy
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Radiation, Light and Illumination | 62 | 10 |
| General Lectures on Electrical Engineering | 4 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 12: Illumination And Illuminating Engineering - 25 hit(s)
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... as such includes the effect of shadows as causing differences in intensity at the edge of objects. The physical quantities with which we have to deal in illumi- nating engineering thus are : The intensity of the light source or the illuminant, and its brilliancy, that is, the flux density at the surface of the illuminant; The flux of light, that is, the total visible radiation issuing from the illuminant; 256 ILLUMINATION AND ILLUMINATING ENGINEERING. 257 The light flux density, that is, the distribution o ...Lecture 10: Light Flux And Distribution - 15 hit(s)
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... /> = 0 to the angle <£ = fa against the vertical or symmetry axis, then is fc1 = 2 TT / sin <t>dfa (3) */0 and the light flux in a zone between the angles (j)1 and fa is (4) I. DISTRIBUTION CURVES OF RADIATION. (1) Point, or Sphere, of Uniform Brilliancy. In this case, the intensity distribution is uniform, and thus, if / = intensity of light, in candles, <£= 4 nl = light flux, in lumens; (5) or, inversely: <I> / = -. (6) The brilliancy of a radiator is the light-flux density at its sur- face. Th ...Lecture 13: Physiological Problems Of Illuminating Engineering - 8 hit(s)
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... well understood and such that they can be taken into consideration in the physical design of the illumina- tion, and thus no excuse exists to fail in their fulfillment, though it is frequently done. Such, for instance, is the requirement of low intrinsic brilliancy in the field of vision, of the color of the light, etc. Other physiological requirements are still very little 277 278 RADIATION, LIGHT, AND ILLUMINATION. understood or entirely unknown, while on others not sufficient quantitative data are available ...Lecture 17: Arc Lighting - 4 hit(s)
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... he field of vision where we want to see objects, than if the source of light were taken out of the field of vision. By eliminating the source of light from the field of vision and eliminating the contraction of the pupils resulting from the high intrinsic brilliancy of the illuminating LIGHT AND ILLUMINATION 251 body, we get actually a much larger amount of light into the eye with the same amount of light striking the illuminated object ; that is, we get a higher physiological efficiency. Even with a much smaller ...Lecture 6: Luminescence - 4 hit(s)
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... mospheric pressures to the Geissler tube glow in the vacuum; but the change is gradual, thus showing the identity of the two phenomena. At atmospheric pressure, disruptive conduction occurs by a sharply denned, relatively thin and noisy spark of very high brilliancy, which traverses the space between the electrodes in an erratic zigzag path, not unlike in appearance to the mechanical fracture of a solid material; and, indeed, the spark is an electrostatic rupture of the gas. If the electrostatic field is fairly unifo ...Lecture 1: Nature And Different Forms Of Radiation - 3 hit(s)
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... he speed at which the light disappears, the time it takes the disk to move half the pitch of a hole is equal to the time it takes the light to travel 10 miles. Increasing still further the velocity of the disk D, the light appears again, and increases in brilliancy, reaching a maximum at twice the speed at which it had disappeared. Then the light reflected from the mirror M again passes through the center of a hole into the telescope, but not through the same hole Ht through which it would have passed with the disk ...Lecture 2: Relation Of Bodies To Radiation - 2 hit(s)
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... possibly to a higher temperature and greater thickness of their atmosphere, and sometimes bright lines and dark lines occur simultaneously, or dark lines may change to bright lines at such places at which, by some activity, as a tem- perature rise, their brilliancy is greatly increased. FIG. 18. Combinations of the different types of spectra: continuous spectrum, line spectrum, band spectrum, reversed spectrum, frequently occur, as we have seen bands and lines together in the modified mercury spectrum, and in th ...Lecture 4: Chemical And Physical Effects Of Radiation - 2 hit(s)
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... ly spreading, they appear — especially against a dark background — as brilliant luminous clouds of orange, red and green, and seen through a red glass they appear like clouds of fire. I change to the illumination given by the incandescent lamp and all the brilliancy disappears, fluorescence ceases and we have a dull red colored solution. I show you here the sample card of a silk store of different colored silks. Looking at it through a red glass, in the mercury light all disappear except a few, which you can pick out ...Lecture 5: Temperature Radiation - 1 hit(s)
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... 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 power input and thereby the radi- ated power to T^ it becomes invisible, but if we move away from the lamp to 10 times the previous distance, we get only T^ the radiation reaching our eyes and still the light is very plainly 74 RADIAT ...Lecture 7: Flames As Illuminants - 1 hit(s)
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... lames are blue. 60. While light, and radiation in general, can also be pro- duced by the combustion of other materials besides hydro- carbons, industrially other materials are very little used. Burning magnesium gives a luminous flame of extremely high brilliancy and whiteness. Its light is largely due to tem- perature radiation, and the flame makes its own incandescent radiator; but unlike the hydrocarbon flame, in which the radiator is again destroyed by combustion, the incandescent radiator of the magnesium fla ...Lecture 11: Light Intensity And Illumination - 1 hit(s)
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... reflected from the mirror, and, due to the eccentric location of the filament, the reflected rays are collected into an angle of about 45 deg. from the vertical, and cross each other, thereby producing the intensity maximum at 4> = 30 deg. The intrinsic brilliancy is sufficiently reduced, and the distribution curve smoothed out, by the frosting of the globe as far as not cov- ered by the reflector. The light in the upper hemisphere beyond </> = (j>2 then is only that reflected by the frosting. The numerica ...