In the United States in the 19th century, a new source of artificial light was needed to replace the inconveniences of flickering light produced by fats, whale oil, and other substances.
19. sajandi Ameerika Ühendriikides hakati otsima uut kunstliku valgustuse allikat, mis asendaks ebamugavalt võbeleva valgusega rasva - ja vaalaõlilampe ning muid lampe.