UTAH ACADEMY OF SCIENCES 37 
INTENSITY AND DISTRIBUTION OF 
ILLUMINATION FROM AUTO- 
MOBILE HEADLIGHTS. 
BY ORSON SMITH. 
(Abstract). 
Automobile headlights fitted with various types of 
lenses have been tested to determine the relative distri- 
bution of light about each type. In each case a curve 
has been plotted showing the results of the test. 
Measurements were taken by means of a portable 
photometer constructed by placing a Bunsen screen in 
one end of a light-proof box, four inches square and four 
feet long, and a portable lamp carriage in the opposite end 
The instrument was calibrated to read directly in foot 
candles by comparing it to a standard lamp, certified by 
the Electrical Testing Laboratories. 
