Pendant Fitila Dusar kankara ita ce rufi da hasken lantarki. Samun dacewarsa shine tsari na walƙiyarsa ta hanyar daidaituwa yana godiya ga tsarin smoothan fulawa mai laushi. Mataki-mataki mataki ta hanyar wasa tare da counterweight mai amfani zai sami damar haɓaka da rage hasken. Matsakaitan wannan ƙira yana tunatar da matakai daban-daban na yin dusar ƙanƙarau daga farko tare da tetrahedron har ƙarshe tare da ƙarfe uku na fangal. Ana shigar da kwan fitilar amon Edison kwano a cikin akwatin da aka keɓe na tetrahedral wanda aka yi da opalescent farin plexi, lokacin da aka rufe ƙirar.