Osmium from a volatile compound of same thus deposited makes a filament as good as carbon when in vacuo. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
At the commencement of his new attempts, Edison returned to his experiments with carbon as an incandescent burner for a lamp, and made a very large number of trials, all in vacuo. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Carbon crucible kept brilliantly incandescent by current in vacuo, for obtaining reaction with refractory metals. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Within a few days this was followed by experiments with the same kind of carbon, but in vacuo by means of a hand-worked air-pump. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.