Abstract :
Just as tables of recommended illumination values have had to be revised upward again and again as accumulating experience has demonstrated the value of higher illumination levels, so has it been necessary again to increase the upper limit of the foot-candle meter scale. The latest type of instrument will read any illumination value from twelve-thousandths of a foot-candle to one hundred foot-candles. It may be used equally well for measuring the illumination from street lighting equipment or the intensity in a well lighted show window.
