Table 160 (continued) 471 



HORIZONTAL VISIBILITY 



Table 160-C1. — Visual range of point sources of light 



Function (loge h — loge E) 



Threshold illuminance (flux-density), E, lumens km.- a 



1X10' 2X10 8 3X10 2 4X10 2 5X10 2 6X10* 7X10* 8X10 2 9X10 2 



SMITHSONIAN METEOROLOGICAL TABLES 



