EXPOSURE AND EXPOSURE DEVICES 



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Table IX. — Showing Variation of Exposure Due to Changes op Light during 



THE Day 



This table gives the variation in exposure time which is required for various portions of the day and 

 year, and for various latitudes from 65°N. to 65°S. The table may be used in conjunction with Table II 

 for determining recommended exposures for outdoor subjects, or subjects lighted from daylight rather 

 than artificial light. 



The table is calculated for local standard time. If daylight-saving time is in effect, correct the 

 actual time to standard time by subtracting 1 hr. before using the tables. Daylight-saving time is one 

 hour earlier than standard time. 



The table is calculated on the basis of clear sky, unobstructed by clouds. 



