More sensitive molybdenite receiver cells, which also had greater sensitivity to infra-red radiation, replaced the older selenium cells in 1917.
12.
Compared with the earlier copper oxide rectifier, the selenium cell could withstand higher voltage but at a lower current capacity per unit area.
13.
Moving images were not possible because, in the scanner : " the sensitivity was not enough and the selenium cell was very laggy ".
14.
Moving images were not possible because, in the scanner, " the sensitivity was not enough and the selenium cell was very laggy ".
15.
Stebbins and Fay C . Brown soon became friends and in time, they had a selenium cell positioned on the telescope at the observatory.
16.
Pictures would be focused on an array of selenium cells and signals from the selenium cells would be transmitted to a distant station on separate wires.
17.
Pictures would be focused on an array of selenium cells and signals from the selenium cells would be transmitted to a distant station on separate wires.
18.
Selenium cells found other applications however, for example as light sensors for exposure timing in photo cameras, where they were common well into the 1960s.
19.
Upon his return from sabbatical in August 1913, Stebbins ended his pioneering work with the selenium cell and began working with Kunz on the new photometer.
20.
The selenium cell was used in the photophone developed by Alexander Graham Bell in 1879 . Selenium transmits an electric current proportional to the amount of light falling on its surface.
