... of a specially constructed luminance meter, a DC amplifier, and a strip-chart recorder, all mounted in a 1965 Ford station wagon. ... of marks placed on the edge of the chart at approximately 5-min intervals by means of a manually operated event marker. ... Readings were recorded from 7:30 a.m. until about 12: 30 p.m. on an overcast summer day with the ambient light level ranging from 45 to 345 ft-c.
|Title||:||Highway Research Record|