Popular Mechanics, heinäkuu 1928
In a relatively few days, men at the bureau of standards determine the quality of paint samples by subjecting them to artificial weather tests. The experiments quickly achieve what would require weeks or years to do under natural conditions. A carbon arc produces the effect of the sun's rays, and water spray and ozonized air duplicate the action of rains and time. According to the investigators, the results of these accelerated tests are strikingly like the effects produced under actual exposure. Instead of trusting to a cisual inspection of the breakdown in the paints, means have been developed for measuring the extent of failure by other methods.