Answer:
Vacuum lamp experiment
Step-by-step explanation:
Edison began his work on electricity the year 1878, where he made use of platinum wire to make filaments for his lamp as the melting point of Platinum is.
However, later he concluded that Platinum pores absorbed air while heating thus reducing its melting point.
So he came up with the idea of vacuum lamp and developed quite a good vacuum lamp with the help of carbon.
Being highly resistive in nature, carbon would end up burning at quite a rapid rate.
Along with his staff, in the year 1879, Edison conducted his first fruitful experiment by using vacuum lamp with carbon filament.