Convention, Volume 1;Volume 30 |
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Halaman 327
... FLICKER AT WHICH VARIATIONS IN ILLUMINATION VANISH It is well known that are lamps operating on 60 - cycle alter- nating - current circuits and subject , therefore , to 120 cycles of flicker per second , produce visible flickering of ...
... FLICKER AT WHICH VARIATIONS IN ILLUMINATION VANISH It is well known that are lamps operating on 60 - cycle alter- nating - current circuits and subject , therefore , to 120 cycles of flicker per second , produce visible flickering of ...
Halaman 328
... flicker . In Figure 4 the same motor is provided with a pair of discs with four 45 - degree windows , with similar closing adjustments . Each revolution of the motor shaft will in this case produce four complete cycles of flicker . The ...
... flicker . In Figure 4 the same motor is provided with a pair of discs with four 45 - degree windows , with similar closing adjustments . Each revolution of the motor shaft will in this case produce four complete cycles of flicker . The ...
Halaman 329
... flicker , or estimated the illumination on the circular photometer screen n as steady . This observation was repeated with each of three observers in such a manner that each formed an independent estimate of the vanish- ing - flicker ...
... flicker , or estimated the illumination on the circular photometer screen n as steady . This observation was repeated with each of three observers in such a manner that each formed an independent estimate of the vanish- ing - flicker ...
Halaman 330
... flicker frequencies is plotted in curve A , Figure 5 , where the ordinates are mean frequencies of flicker , and the abscissę are maximum cyclic illuminations on the target , expressed in metre - candles . Addi- tional scales are ...
... flicker frequencies is plotted in curve A , Figure 5 , where the ordinates are mean frequencies of flicker , and the abscissę are maximum cyclic illuminations on the target , expressed in metre - candles . Addi- tional scales are ...
Halaman 331
... flicker at which the illumination appeared to become steady was over 53 cycles per second . The reason for the greater mean vanishing - flicker frequency with the larger white target is believed to be found in the increased surface area ...
... flicker at which the illumination appeared to become steady was over 53 cycles per second . The reason for the greater mean vanishing - flicker frequency with the larger white target is believed to be found in the increased surface area ...
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