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By Guy C. Suits

ISBN-10: 0080093620

ISBN-13: 9780080093628

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Apparently a continued dark adaptation stronger than any effects of fatigue must account for the lower values of the second series. F i g . 4 and F i g . 5 show curves for two observers at three and six m distance, and a one second on, one second off flash after one half hour for dark adaption. T h e asymptotic values for zero background brightness 14 A Study of Light Signals in Aviation and Navigation 9 are indicated by the arrows and are of the same order as those for 1 0 ~ candles 2 per c m .

17 starlight), it is thus possible to see the light flashes reflected down from clouds at a height of 1000 m from 3 Langmuir Memorial Volume X A 34 Study of Light Signals in Aviation TABLE and Navigation VI The Candle Power of a Point Source Needed to Give a Distinctly Visible \-second Flash (2 X Threshold) on a White Diffusing Surface {Cloud or Snow) 2 at Distance D. H = Steady Illumination of the Surface in c · cm~ D= H ioioioio- 9 15c 8 71 7 D= 2km D= 5 km 60 375 284 1770 600 2400 15,000 5000 20,000 125,000 32,000 128,000 800,000 e 7x10-« 1km a flashing point source of only 71 candles on the ground.

Every point in the plot represents the average of ten observations. 24 m m area illuminated to various brightnesses. 0033 respectively. 5 m. T h e observer J . S. 0033 candles required a finding time of only 12 sec. for a flashing light of 5 times threshold intensity. 0011 candles the time was 11 sec. A Study of Light Signals in Aviation and Navigation 21 as an average of 32 observations. Notwithstanding the greater intensities of these disturbing lights the finding times are considerably less than those shown in Fig.

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Atmospheric Phenomena. The Collected Works of Irving Langmuir with Contributions in Memoriam Including a Complete Bibliography of His Works by Guy C. Suits


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