Word: mazda
(lookup in dictionary)
(lookup stats)
Dates: during 1930-1939
Sort By: most recent first
(reverse)
...filament. When the electric switch is turned, current heats the filament to incandescence. The heat vaporizes the mercury. The mercury vapor diffuses between the electrodes and permits the current to jump across as a brilliant mercury arc. The combined light of arc, electrodes and filament appears much whiter than Mazda "daylight" bulbs. It produces 40 times as much humanly beneficial ultraviolet radiation as does the midday midsummer sun of equal intensity...