A theorefical taeatment of burnout of incandescent lamp filaments based on hot spot model is presented. Five kinds of filament defects such as irregularity of wire diameter, electric resistance, radiant emittance, evaporation rate and coil pitch are considered. The effects of these filament defects are summarized in ferm of final current loss.
A few experiments were performed and the results suggested that the defects caused by the coilng process mere responsible for burnout of filaments.
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