Edison's research team was aware of the large negative temperature coefficient of resistance of possible lamp filament materials and worked extensively during the period 1878–1879 on devising an automatic regulator or ballast to stabilize current. It wasn't until 1879 that it was realized a self-limiting lamp could be built. See Friedel, Robert; Israel, Paul (2010). Edison's Electric Light: The Art of Invention (Revised изд.). The Johns Hopkins University Press. стр. 29—31. ISBN978-0-8018-9482-4. Архивирано из оригинала 6. 12. 2017. г. Приступљено 3. 7. 2018.Непознати параметар |name-list-style= игнорисан (помоћ)
Edison's research team was aware of the large negative temperature coefficient of resistance of possible lamp filament materials and worked extensively during the period 1878–1879 on devising an automatic regulator or ballast to stabilize current. It wasn't until 1879 that it was realized a self-limiting lamp could be built. See Friedel, Robert; Israel, Paul (2010). Edison's Electric Light: The Art of Invention (Revised изд.). The Johns Hopkins University Press. стр. 29—31. ISBN978-0-8018-9482-4. Архивирано из оригинала 6. 12. 2017. г. Приступљено 3. 7. 2018.Непознати параметар |name-list-style= игнорисан (помоћ)